o 37 words
Words written this way

37 different Yorùbá words are written o once tone marks and underdots are removed. Tone is part of the word, not decoration: these are as different from each other as any other words are.

o character · etym. 1 The sixteenth letter of the Yoruba alphabet, called ó and written in the Latin script. ó noun · etym. 1 The name of the Latin script letter O/o. o pron · etym. 2 you (second-person singular non-honorific personal pronoun) ó pron · etym. 3 he/she/it (third-person singular non-honorific personal pronoun) o pron · etym. 4 him, her, it (third-person singular object pronoun following a monosyllabic verb with a high-tone /o/) ó pron · etym. 4 him, her, it (third-person singular object pronoun following a monosyllabic verb with a low- or mid-tone /o/) o intj · etym. 5 Used at the end of sentences to emphasize a statement. ò particle · etym. 6 not (placed before a verb to negate it, frequently used after personal pronouns) ò verb · etym. 7 alternative form of wò (“to look at”) O character The sixteenth letter of the Yoruba alphabet, called ó and written in the Latin script. character The seventeenth letter of the Yoruba alphabet, called ọ́ and written in the Latin script. character · etym. 1 The seventeenth letter of the Yoruba alphabet, called ọ́ and written in the Latin script. ọ́ noun · etym. 1 The name of the Latin script letter Ọ/ọ. pron · etym. 2 you (second-person singular non-honorific object pronoun following a high-tone monosyllabic verb) ọ́ pron · etym. 2 you (second-person singular non-honorific object pronoun following a low- or mid-tone monosyllabic verb) pron · etym. 3 him, her, it (third-person singular non-honorific object pronoun following a monosyllabic verb with a high-tone /ɔ/) ọ́ pron · etym. 3 him, her, it (third-person singular non-honorific object pronoun following a monosyllabic verb with a low- or mid-tone /ɔ/) character The letter ⟨Ọ⟩ with falling tone character The letter ⟨ọ⟩ with falling tone ɔ́ character The letter ⟨ɔ⟩ with high tone ɔ̂ character The letter ⟨ɔ⟩ with falling tone ɔ̌ character The letter ⟨ɔ⟩ with rising tone Ɔ́ character The letter ⟨Ɔ⟩ with high tone Ɔ̂ character The letter ⟨Ɔ⟩ with falling tone Ɔ̌ character The letter ⟨Ɔ⟩ with rising tone ọ́ character The letter ⟨ọ⟩ with high tone Ọ́ character The letter ⟨Ọ⟩ with high tone Ɔ̀ character The letter ⟨Ɔ⟩ with low tone ɔ̀ character The letter ⟨ɔ⟩ with low tone ọ̀ character The letter ⟨ọ⟩ with low tone Ọ̀ character The letter ⟨Ọ⟩ with low tone ọ̌ character The letter ⟨ọ⟩ with rising tone ọ̄ character The letter ⟨ọ⟩ with mid tone (not usually marked overtly) Ọ̄ character The letter ⟨Ọ⟩ with mid tone (not usually marked overtly) Ọ̌ character The letter ⟨Ọ⟩ with rising tone Ɔ̄ character The letter ⟨Ɔ⟩ with mid tone (not usually marked overtly) ɔ̄ character The letter ⟨Ɔ⟩ with mid tone (not usually marked overtly)
Source: Wiktionary. This page is not a dictionary entry — it lists the words written one way, and nothing else.