| on route to(expression, idiom) | |
| on that occasion(expression, idiom, the present time) | |
| onward(adverb, near, touching, forward, supported) | |
| opposed to(verb, expression, phrasal verb) | |
| opposite | |
| over against | |
| pander to | |
| pertaining to | |
| pertinent to | |
| place | |
| position | |
| post | |
| predicament | |
| qualitative | |
| referring to | |
| regarding | |
| relating to | |
| relative to | |
| respecting | |
| resting on(expression, adverb, preposition, near, touching) |
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| APA | Smart Define. (2016). upon thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/upon/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "upon thesaurus" https://smartdefine.org/upon/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, upon thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/upon/thesaurus/synonyms>. |
| MLA | Smart Define. "upon thesaurus" 1 April 2016. Web. 21 September 2026. <https://smartdefine.org/upon/thesaurus/synonyms> |