| oxygen | |
| uh-oh | |
| zero(noun, zero) | |
| letter o | |
| type O | |
| group O | |
| atomic number 8 | |
| al | |
| cipher | |
| oh | |
| achoo | |
| ahem | |
| ak | |
| ala | |
| alas | |
| anticoagulant | |
| huggermugger(adverb, secretly) | |
| aorta | |
| ar | |
| ariz |
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| APA | Smart Define. (2015). o thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/o/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "o thesaurus" https://smartdefine.org/o/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, o thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/o/thesaurus/synonyms>. |
| MLA | Smart Define. "o thesaurus" 7 November 2015. Web. 21 September 2026. <https://smartdefine.org/o/thesaurus/synonyms> |