| activated | |
| actuated | |
| admit(verb, open, start, initiate, enter) | |
| advance guard | |
| adviser(noun, guide, model, leader, director) | |
| aforeknown | |
| aforementioned | |
| aforesaid | |
| ahead(adjective, head, beginning, opening, original) | |
| ahead of | |
| airhead | |
| alpinist | |
| analyst(noun, person, search, first) | |
| anatomist(noun, person, search, first) | |
| announcer | |
| antecessor(noun, precursor) | |
| anterior(adjective, head, beginning, prime, past) | |
| appear(verb, open, leave, establish, create) | |
| archetypal(authentic, first, previous, initial, earliest) | |
| arise(verb, open, leave, establish, create) |
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| APA | Smart Define. (2015). pioneer thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/pioneer/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "pioneer thesaurus" https://smartdefine.org/pioneer/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, pioneer thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/pioneer/thesaurus/synonyms>. |
| MLA | Smart Define. "pioneer thesaurus" 17 December 2015. Web. 28 September 2026. <https://smartdefine.org/pioneer/thesaurus/synonyms> |