15-letter words with the ninth letter "O"

Here are 15-letter words with the ninth letter "O". Common endings here include -SS, -ES, -NG, and -ST. That pattern fits the constraint well. Strong fits: ACRIMONIOUSNESS, ADENOHYPOPHYSES, ADENOHYPOPHYSIS, and ADVENTUROUSNESS.

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15-letter words appear mostly in crosswords and word wheel puzzles; filter by the letters you already have to narrow this list to your answer.

📝Results (241 words)

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Pattern Insights

Common pairs
ES, IO, ON
Top endings
-SS, -ES, -NG
Middle letters
I, T, R
Double letters
38% of results
Position 1
C, P, A
Total matches
241 words