11-letter words ending in O
There are 16 eleven-letter words here. None of them are common enough to be a likely puzzle answer, which is worth knowing before you spend a guess here. The ones you are most likely to want are embarcadero, archipelago, chiaroscuro, amontillado. Structurally, 16 contain a repeated letter, 16 carry three or more vowels — useful when you already know a vowel is missing. The letters that turn up most across this set are C, E, I.
Also valid (16)
How to use this list
The list above is every word in the dictionary that fits, sorted so the ordinary vocabulary sits at the top. If you already know more than the pattern in the heading — a letter that is definitely absent, or one that is present but in the wrong place — the solver takes all of that at once and reproduces the game's own colouring rule, including the awkward case of repeated letters.