Here is the list of all the English words containing letter O grouped by number of letters: o, ao, a.o., bo, CO, ℅, CO₂, do, D.O., EO, fo, F/O, GO, G.O., ho, H₂O, h/o, IO.
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Please note: the Wiktionary contains many more words - in particular proper nouns and inflected forms: plurals of nouns and past tense of verbs - than other English language dictionaries such as the Official Scrabble Players Dictionary (OSPD) from Merriam-Webster, the Official Tournament and Club Word List (OTCWL / OWL / TWL) from the National Scrabble Association, and the Collins Scrabble Words used in the UK (about 180,000 words each). LotsOfWords knows 480,000 words.