14-letter words starting with O

14-letter words starting with O number 375, from overpopulation to specialist terms such as otolaryngology.

375 wordsTop pick ORGANIZATIONALHighest score OVEREMPHASIZED 34

3 of 375 are everyday words (1%). Mostly rare words: great for Scrabble, tough for daily puzzles.

Letter
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z

P starts the most 14-letter words (1,095); Y starts the fewest (6). O ranks #13 of 26. The bar under each letter shows the size of its list.

Length
2
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15

Best words to play first 375 · most-used first

ORGANIZATIONAL₂₄
OVERWHELMINGLY₂₉
ORGANISATIONAL₁₅
OSTEOARTHRITIS₁₇
OVERPOPULATION₂₁
OVERPROTECTIVE₂₄
OPTIMISTICALLY₂₃
OVERPRODUCTION₂₂
OVERCONFIDENCE₂₅
OVERSIMPLIFIED₂₅
ORGANOMETALLIC₁₉
OTOLARYNGOLOGY₂₂
OVERESTIMATING₂₀
ORNITHOLOGICAL₂₀
OBSTRUCTIONIST₁₈
OVERCOMPENSATE₂₃
ORNITHOLOGISTS₁₈
OPTOELECTRONIC₂₀
OVERSUBSCRIBED₂₄
OSTENTATIOUSLY₁₇
OBSTRUCTIONISM₂₀
ORCHESTRATIONS₁₉
OVERESTIMATION₁₉
OCEANOGRAPHERS₂₂
OVERINDULGENCE₂₁
OVEREMPHASIZED₃₄
OVERSTIMULATED₂₀
OUTPERFORMANCE₂₃
OXIDOREDUCTASE₂₅
OCCUPATIONALLY₂₃
OVERSIMPLIFIES₂₄
OVERCOMPLICATE₂₅
ONCHOCERCIASIS₂₃
OUTRAGEOUSNESS₁₅
OYSTERCATCHERS₂₄
OPPOSITIONISTS₁₈
OPHTHALMOLOGIC₂₇
ORGANOCHLORINE₂₀
OVERSATURATION₁₇
OPHTHALMOSCOPE₂₈
OVERCORRECTION₂₁
OVERREGULATION₁₈
ORTHOPHOSPHATE₂₇
OVERSTRETCHING₂₃
OVERDETERMINED₂₁
OBSEQUIOUSNESS₂₅
OVERPOWERINGLY₂₆
ORTHOGRAPHICAL₂₅

Showing the top 48 of 375 words. See every valid word

All valid words 375

A to Z. Includes rare and Collins-only words. Linked tiles open the word's meaning, score and rhymes.

OBDURATENESSES₁₇
OBEDIENTIARIES₁₇
OBJECTIVATIONS₂₈
OBJECTLESSNESS₂₅
OBLIGATORINESS₁₇
OBLIGINGNESSES₁₈
OBSEQUIOUSNESS₂₅
OBSERVABLENESS₂₁
OBSESSIONALISM₁₈
OBSESSIONALITY₁₉
OBSOLETENESSES₁₆
OBSTREPERATING₁₉
OBSTREPEROUSLY₂₁
OBSTRUCTIONISM₂₀
OBSTRUCTIONIST₁₈
OCCASIONALISMS₂₀
OCCASIONALISTS₁₈
OCCIDENTALISED₂₀
OCCIDENTALISES₁₉
OCCIDENTALISMS₂₁
OCCIDENTALISTS₁₉
OCCIDENTALIZED₂₉
OCCIDENTALIZES₂₈
OCCUPATIONALLY₂₃
OCEANOGRAPHERS₂₂
OCEANOGRAPHIES₂₂
OCTINGENTENARY₂₀
OCTODECILLIONS₁₉
ODONATOLOGISTS₁₆
ODONTOGLOSSUMS₁₈
ODONTOGRAPHIES₂₁
OESOPHAGITISES₂₀
OESOPHAGOSCOPE₂₄
OESOPHAGOSCOPY₂₇
OLALLIEBERRIES₁₆
OLEAGINOUSNESS₁₅
OLEOMARGARINES₁₇
OLFACTOLOGISTS₂₀
OLFACTOMETRIES₂₁
OLIGARCHICALLY₂₅
OLIGOCYTHAEMIA₂₅
OLIGOPSONISTIC₁₉
OMBUDSMANSHIPS₂₆
OMISSIVENESSES₁₉
OMNIBENEVOLENT₂₁
OMNICOMPETENCE₂₄
OMNIVOROUSNESS₁₉
OMPHALOMANCIES₂₅
OMPHALOSKEPSES₂₇
OMPHALOSKEPSIS₂₇
ONCHOCERCIASES₂₃
ONCHOCERCIASIS₂₃
ONCOGENETICIST₁₉
ONCOGENICITIES₁₉
ONCORNAVIRUSES₁₉
ONEIROCRITICAL₁₈
ONEIROSCOPISTS₁₈
ONOMASIOLOGIES₁₇
ONOMATOLOGISTS₁₇
ONOMATOPOIESES₁₈
ONOMATOPOIESIS₁₈
ONYCHOPHAGISTS₂₈
OOPHORECTOMIES₂₃
OOPHORECTOMISE₂₃
OOPHORECTOMIZE₃₂
OPACIFICATIONS₂₃
OPENHANDEDNESS₂₁
OPERATIONALISM₁₈
OPERATIONALIST₁₆
OPHIDIOPHOBIAS₂₇
OPHIDIOPHOBICS₂₉
OPHTHALMITISES₂₄
OPHTHALMOLOGIC₂₇
OPHTHALMOMETER₂₆
OPHTHALMOMETRY₂₉
OPHTHALMOSCOPE₂₈
OPHTHALMOSCOPY₃₁
OPINIONATIVELY₂₂
OPISTHOBRANCHS₂₆
OPISTHOCOELIAN₂₁
OPISTHOCOELOUS₂₁
OPISTHOGLOSSAL₂₀
OPISTHOGRAPHIC₂₇
OPISTHOTONOSES₁₉
OPPIGNORATIONS₁₉
OPPOSABILITIES₂₀
OPPOSITENESSES₁₈
OPPOSITIONISTS₁₈
OPPOSITIONLESS₁₈
OPPRESSIVENESS₂₁
OPSONIFICATION₂₁
OPTIMALISATION₁₈
OPTIMALIZATION₂₇
OPTIMISTICALLY₂₃
OPTOELECTRONIC₂₀
ORACULARNESSES₁₆
ORBICULARITIES₁₈
ORCHARDGRASSES₂₁
ORCHESTRALISTS₁₉
ORCHESTRATIONS₁₉
ORCHIDECTOMIES₂₄
ORCHIDOLOGISTS₂₁
ORCHIDOMANIACS₂₄
ORDINARINESSES₁₅
ORGANISABILITY₂₀
ORGANISATIONAL₁₅
ORGANISMICALLY₂₂
ORGANIZABILITY₂₉
ORGANIZATIONAL₂₄
ORGANOCHLORINE₂₀
ORGANOGRAPHIES₂₁
ORGANOGRAPHIST₂₁
ORGANOMETALLIC₁₉
ORIENTALIZINGS₂₄
ORNAMENTALISMS₁₈
ORNAMENTATIONS₁₆
ORNITHICHNITES₂₂
ORNITHISCHIANS₂₂
ORNITHODELPHIC₂₅
ORNITHOLOGICAL₂₀
ORNITHOLOGISTS₁₈
ORNITHOMANCIES₂₁
ORNITHOMORPHIC₂₆
ORNITHOPHILIES₂₂
ORNITHOPHILOUS₂₂
ORNITHOPHOBIAS₂₄
ORNITHOSCOPIES₂₁
OROBANCHACEOUS₂₃
OROGENETICALLY₂₀
OROGRAPHICALLY₂₅
OROROTUNDITIES₁₅
ORTHOCEPHALIES₂₄
ORTHOCEPHALOUS₂₄
ORTHOCHROMATIC₂₆
ORTHODIAGONALS₁₉
ORTHOGENICALLY₂₃
ORTHOGNATHISMS₂₃
ORTHOGONALISED₁₉
ORTHOGONALISES₁₈
ORTHOGONALIZED₂₈
ORTHOGONALIZES₂₇
ORTHOGRAPHICAL₂₅
ORTHOGRAPHISTS₂₃
ORTHOHYDROGENS₂₅
ORTHOMOLECULAR₂₁
ORTHOMYXOVIRUS₃₂
ORTHOPEDICALLY₂₅
ORTHOPHOSPHATE₂₇
ORTHOPINAKOIDS₂₄
ORTHOPTEROLOGY₂₃
ORTHOPYROXENES₂₉
ORTHOSILICATES₁₉
OSCILLOGRAPHIC₂₄
OSMOMETRICALLY₂₃
OSMOREGULATION₁₇
OSMOREGULATORY₂₀
OSTENTATIOUSLY₁₇
OSTEOARTHRITIC₁₉
OSTEOARTHRITIS₁₇
OSTEOARTHROSES₁₇
OSTEOARTHROSIS₁₇
OSTEODERMATOUS₁₇
OSTEOLOGICALLY₂₀
OSTEOSARCOMATA₁₈
OSTREICULTURES₁₆
OTOLARYNGOLOGY₂₂
OUTDATEDNESSES₁₆
OUTFANGTHIEVES₂₄
OUTGENERALLING₁₆
OUTGOINGNESSES₁₆
OUTLANDISHNESS₁₈
OUTMANEUVERING₂₀
OUTMANIPULATED₁₉
OUTMANIPULATES₁₈
OUTMANOEUVRING₂₀
OUTMODEDNESSES₁₈
OUTPERFORMANCE₂₃
OUTPOLITICKING₂₃
OUTRAGEOUSNESS₁₅
OUTRECUIDANCES₁₉
OUTREPRODUCING₂₀
OUTRIGHTNESSES₁₈
OUTSETTLEMENTS₁₆
OUTSIDERNESSES₁₅
OVARIECTOMISED₂₂
OVARIECTOMIZED₃₁
OVERABSTRACTED₂₂
OVERABUNDANCES₂₂
OVERABUNDANTLY₂₃
OVERACCENTUATE₂₁
OVERACTIVITIES₂₂
OVERADJUSTMENT₂₇
OVERADVERTISED₂₂
OVERADVERTISES₂₁
OVERAGGRESSIVE₂₂
OVERANALYTICAL₂₂
OVERARTICULATE₁₉
OVERASSERTIONS₁₇
OVERASSESSMENT₁₉
OVERATTENTIONS₁₇
OVERBREATHINGS₂₃
OVERBURDENSOME₂₂
OVERBURTHENING₂₃
OVERCAPACITIES₂₃
OVERCAPITALISE₂₁
OVERCAPITALIZE₃₀
OVERCAUTIONING₂₀
OVERCAUTIOUSLY₂₂
OVERCENTRALISE₁₉
OVERCENTRALIZE₂₈
OVERCLASSIFIED₂₃
OVERCLASSIFIES₂₂
OVERCOMMITMENT₂₅
OVERCOMMITTING₂₄
OVERCOMPENSATE₂₃
OVERCOMPLIANCE₂₅
OVERCOMPLICATE₂₅
OVERCOMPRESSED₂₄
OVERCOMPRESSES₂₃
OVERCONCERNING₂₂
OVERCONFIDENCE₂₅
OVERCONSTRUCTS₂₁
OVERCONTROLLED₂₀
OVERCORRECTING₂₂
OVERCORRECTION₂₁
OVERDECORATING₂₁
OVERDECORATION₂₀
OVERDEPENDENCE₂₃
OVERDETERMINED₂₁
OVERDETERMINES₂₀
OVERDEVELOPING₂₄
OVERDIAGNOSING₂₀
OVERDISCOUNTED₂₁
OVERDOCUMENTED₂₃
OVERDOMINANCES₂₂
OVERDRAMATISED₂₁
OVERDRAMATISES₂₀
OVERDRAMATIZED₃₀
OVERDRAMATIZES₂₉
OVEREDUCATIONS₂₀
OVERELABORATED₂₀
OVERELABORATES₁₉
OVEREMPHASISED₂₅
OVEREMPHASISES₂₄
OVEREMPHASIZED₃₄
OVEREMPHASIZES₃₃
OVERENCOURAGED₂₁
OVERENCOURAGES₂₀
OVERENGINEERED₁₉
OVERENTHUSIASM₂₂
OVERESTIMATING₂₀
OVERESTIMATION₁₉
OVEREVALUATING₂₁
OVEREVALUATION₂₀
OVEREXAGGERATE₂₆
OVEREXCITEMENT₂₈
OVEREXERCISING₂₇
OVEREXPANSIONS₂₆
OVEREXPLAINING₂₇
OVEREXPLOITING₂₇
OVEREXTENSIONS₂₄
OVEREXTRACTION₂₆
OVERFASTIDIOUS₂₁
OVERFERTILISED₂₁
OVERFERTILISES₂₀
OVERFERTILIZED₃₀
OVERFERTILIZES₂₉
OVERFINENESSES₂₀
OVERFLOURISHED₂₄
OVERFLOURISHES₂₃
OVERFONDNESSES₂₁
OVERFREIGHTING₂₅
OVERFULFILLING₂₄
OVERFULLNESSES₂₀
OVERGENERALISE₁₈
OVERGENERALIZE₂₇
OVERGENEROSITY₂₁
OVERGENEROUSLY₂₁
OVERGLAMORISED₂₁
OVERGLAMORISES₂₀
OVERGLAMORIZED₃₀
OVERGLAMORIZES₂₉
OVERGLAMOURIZE₂₉
OVERHARVESTING₂₄
OVERHOMOGENISE₂₃
OVERHOMOGENIZE₃₂
OVERIDEALISING₁₉
OVERIDEALIZING₂₈
OVERIDENTIFIED₂₂
OVERIDENTIFIES₂₁
OVERIMPRESSING₂₂
OVERINDULGENCE₂₁
OVERINFLATIONS₂₀
OVERINSURANCES₁₉
OVERINTERPRETS₁₉
OVERINVESTMENT₂₂
OVERKINDNESSES₂₂
OVERLENGTHENED₂₂
OVERMANAGEMENT₂₂
OVERMATURITIES₁₉
OVERMEDICATING₂₃
OVERMEDICATION₂₂
OVERMULTIPLIED₂₂
OVERMULTIPLIES₂₁
OVERMULTITUDED₂₁
OVERMULTITUDES₂₀
OVERNICENESSES₁₉
OVERNOURISHING₂₁
OVERNUTRITIONS₁₇
OVEROPTIMISTIC₂₃
OVERORGANISING₁₉
OVERORGANIZING₂₈
OVERORNAMENTED₂₀
OVERPACKAGINGS₂₇
OVERPARTICULAR₂₁
OVERPERSUADING₂₁
OVERPERSUASION₁₉
OVERPOPULATING₂₂
OVERPOPULATION₂₁
OVERPOWERINGLY₂₆
OVERPREDICTING₂₃
OVERPREDICTION₂₂
OVERPRESCRIBED₂₄
OVERPRESCRIBES₂₃
OVERPRESSURING₂₀
OVERPRIVILEGED₂₄
OVERPROCESSING₂₂
OVERPRODUCTION₂₂
OVERPROGRAMING₂₃
OVERPROGRAMMED₂₅
OVERPROPORTION₂₁
OVERPROTECTING₂₂
OVERPROTECTION₂₁
OVERPROTECTIVE₂₄
OVERRASHNESSES₂₀
OVERREFINEMENT₂₂
OVERREGULATING₁₉
OVERREGULATION₁₈
OVERREPRESENTS₁₉
OVERRESPONDING₂₁
OVERRIPENESSES₁₉
OVERSATURATING₁₈
OVERSATURATION₁₇
OVERSCHEDULING₂₄
OVERSCRUPULOUS₂₁
OVERSECRETIONS₁₉
OVERSIMPLIFIED₂₅
OVERSIMPLIFIES₂₄
OVERSIMPLISTIC₂₃
OVERSOLICITOUS₁₉
OVERSPECIALISE₂₁
OVERSPECIALIZE₃₀
OVERSPECULATED₂₂
OVERSPECULATES₂₁
OVERSTATEMENTS₁₉
OVERSTIMULATED₂₀
OVERSTIMULATES₁₉
OVERSTRETCHING₂₃
OVERSTRUCTURED₂₀
OVERSTRUCTURES₁₉
OVERSUBSCRIBED₂₄
OVERSUBSCRIBES₂₃
OVERSUBTLETIES₁₉
OVERSUSPICIOUS₂₁
OVERSWEETENING₂₁
OVERTIGHTENING₂₂
OVERTREATMENTS₁₉
OVERVALUATIONS₂₀
OVERWEATHERING₂₄
OVERWHELMINGLY₂₉
OXIDOREDUCTASE₂₅
OXYHAEMOGLOBIN₃₂
OXYHEMOGLOBINS₃₂
OXYMORONICALLY₃₁
OYSTERCATCHERS₂₄

Letters by positionIn 52% of these words the 4th letter is R.

2nd letter

V50%
R15%
P8%

3rd letter

E52%
T14%
C6%

4th letter

R52%
H10%
I9%

12th letter

I34%
S19%
O9%

13th letter

E35%
N19%
T8%

14th letter

S45%
G12%
D11%

Highest-scoring words

Scrabble and Words With Friends points, before board bonuses

Score spreadMost of these words score 21 in Scrabble; OVEREMPHASIZED tops the list with 34. Scores before board bonuses.

1515 points: 6 words
16 points: 11 words
1717 points: 16 words
18 points: 26 words
1919 points: 45 words
20 points: 41 words
2121 points: 51 words
22 points: 39 words
2323 points: 34 words
24 points: 29 words
2525 points: 19 words
26 points: 9 words
2727 points: 15 words
28 points: 9 words
2929 points: 10 words
30 points: 5 words
3131 points: 3 words
32 points: 5 words
3333 points: 1 words
34 points: 1 words

Word	Scrabble	Words With Friends	Dictionaries
OVEREMPHASIZED	34	36	All three
OVEREMPHASIZES	33	35	All three
OXYHAEMOGLOBIN	32	35	Collins · NWL
OVERHOMOGENIZE	32	35	All three
OXYHEMOGLOBINS	32	35	All three
OOPHORECTOMIZE	32	34	Collins only
ORTHOMYXOVIRUS	32	33	NWL only
OPHTHALMOSCOPY	31	33	All three
OVARIECTOMIZED	31	34	All three
OXYMORONICALLY	31	34	All three
OVERDRAMATIZED	30	32	All three
OVERCAPITALIZE	30	34	All three

The 375 entries range from familiar-looking compounds such as overpopulation and overprotective to specialist terms such as otolaryngology. Only 3 rank among the top 25,000 English words by frequency, so this is a tournament-word inventory, not a list of everyday vocabulary. Organizational and organisational both appear, so a spelling variant can decide whether a long O word is playable.

How many 14-letter words starting with O are there?

375 words qualify once Collins, NWL2023, and ENABLE are combined.
Collins accounts for 345 of them, NWL2023 for 260, and ENABLE for 215.
Just 3 sit inside the top 25,000 English words by frequency.
The average score is 21.9 points; overemphasized leads at 34.
S is the most common closing letter, on 169 words; G is next at 44.

Which endings are common among 14-letter words starting with O?

Among these 14-letter words starting with O, 169 end in S, compared with 44 in G and 40 in D. S is the standout finish, while E and Y follow with 32 and 30 words apiece.

When a clue points to a final S, try osteoarthritis, ornithologists, or orchestrations. Those examples show how this group spans medical vocabulary, scientific terms, and familiar word forms. Check the ending as well as the first letter: a long match can look convincing while failing the final square.

Which O words score highest?

Overemphasized scores 34 points, the highest among the examples here. Overemphasizes follows at 33, while oxyhaemoglobin, overhomogenize, and oxyhemoglobins each score 32.

A high face value does not guarantee an easy play: the board still needs room for the word, and your tiles must cover its open squares. Dictionary coverage also differs, with 345 matches in Collins against 260 in NWL2023 and 215 in ENABLE. Those counts overlap, so check your game's word list before relying on an unfamiliar form.

Questions people ask

How many 14-letter words start with O?

Count 375 words that open with O and run to fourteen letters. A word enters this tally when any one of Collins, NWL2023, or ENABLE carries it, so the three lists contribute different members.

What is the most common last letter for these O words?

S finished 169 of these O words, more than any other letter. G follows on 44 and D on 40. When the last tile is known to be S, the group is still large, so pair that clue with a rack pattern.

What is the highest-scoring 14-letter word starting with O?

Overemphasized reaches 34, the best raw total here. Overemphasizes is one behind at 33, and oxyhaemoglobin lands on 32. Premium squares and open lanes decide what a placement actually banks.

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