6-letter words with O as the 1st letter and S as the 5th letter

The pattern O _ _ _ S _ gives you a compact set, but the words vary sharply in familiarity. OLDEST, OPPOSE, and OBTUSE are easy to recognize; terms such as OOCYST and OECIST are less likely to come to mind. The strongest clue may be the final letter: most matches end in T or H.

The O-first, S-fifth pattern at a glance

• Collins accepts all 28 matches; ENABLE and NWL2023 each accept 24.
• Only 3 matches fall within the common-word group, so expect obscure entries.
• The list includes 21 defined words, including familiar choices such as OLDEST and OPPOSE.
• OFFISH leads the scoring results at 15 points; OAFISH and OWLISH each score 12.
• T and H are the most frequent final letters, together accounting for 17 matches.

Which six-letter words fit O first and S fifth?

OLDEST, ODDEST, and OFTEST show how often this pattern ends in T; OWLISH and OFFISH show the H ending. Other recognizable options include OPPOSE, OBSESS, OBTUSE, and OBOIST. Each keeps S in the fifth slot, while the second, third, fourth, and final letters do the work of separating one answer from another.

The last-letter split is unusually concentrated: T appears 10 times and H appears 7 times. That makes the final square a strong filter when your clue already fixes O and S. E and M each appear 4 times, while only 2 matches end in S; K appears once.

How should you use these six-letter matches?

For a board game, OFFISH is the scoring standout, but OAFISH and OWLISH also beat the 9.3-point average. OPPOSE and OLDISH score 10 in the results. A high face-value score is not automatically a strong play: check the board for premium squares and opportunities to build across existing tiles.

For a clue-solving game, start with familiar candidates before trying specialist vocabulary. Only 3 of the 28 entries are common, so many valid options will feel unfamiliar. Collins has 4 more matches than ENABLE or NWL2023; check your game's word list before relying on a Collins-only entry.