13-letter words starting with Z

Z is a 10-point tile, so every entry here gets a head start. The average score is 30.5, more than ten points above the 20.4 for thirteen-letter words generally. Zooxanthellae, zombification and zoogeographic are typical, and none of the 28 counts as common English.

Z words at thirteen letters

• 28 words start with Z, the second-smallest opening group at this length after Y.
• ZOO- opens 9 and ZYG- 5, so half the list comes from two roots.
• The average Scrabble score is 30.5, the highest of any opening letter.
• Three words tie at 36: zoopsychology, zygapophyseal and zygapophysial.
• Collins takes 27, while NWL2023 has 10 and ENABLE 9.

ZOO and ZYG cover half the list

Nine words begin with ZOO-, from zooxanthellae and zooplanktonic to zoophysiology and zoopsychology. Five begin with ZYG-, a root about joints and pairing, and zygapophyseal and zygapophysial both reach 36.

The rest are one-offs: zombification, zalambdodonts, zantedeschias, zealousnesses, zeitgeistiest, zinjanthropus and zigzaggedness. Zigzaggedness is the only word in the group with two Z tiles, and it scores 35.

Read the first three letters before anything else. ZOO- and ZYG- between them answer for half the list, and no other opening pair runs past two words.

Why Z words score so high

A Z is worth 10 points, so the first tile alone is worth about a third of a typical total. zygapophyseal and zygapophysial each add two Y tiles at 4 points to reach 36, and zoopsychology matches them.

The floor is what makes the group useful. The lowest score here is 22, which still beats the average for the whole thirteen-letter list, so a Z word is rarely a wasted play.

18 of the 28 appear in Collins but not in NWL2023, which leaves ten for North American players: zealousnesses, zestfulnesses, zombification, zooplanktonic and zooxanthellae among them.

Playing a Z opening