| accident(noun, action, act, event, thing) | |
| achievement(noun, mark, sign, signpost, marker) | |
| act(noun, action, thing, experience, matter) | |
| action(noun, act, thing, experience, matter) | |
| advanced | |
| advent(noun, action, act, thing, experience) | |
| affair(noun, action, act, time, event) | |
| aim(noun, highlight) | |
| ambition(noun, highlight) | |
| apotheosis | |
| appearance(noun, action, act, thing, experience) | |
| avant garde(expression, adjective) | |
| basic | |
| bay the moon(expression, idiom, inutility) | |
| beat the air(expression, idiom, inutility) | |
| boundary mark(expression, idiom) | |
| boundary stone(expression, idiom) | |
| business(noun, action, act, thing, experience) | |
| calamity(noun, action, act, thing, experience) | |
| catastrophe(noun, action, act, thing, experience) |
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| APA | Smart Define. (2015). milestone thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/milestone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "milestone thesaurus" https://smartdefine.org/milestone/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, milestone thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/milestone/thesaurus/synonyms>. |
| MLA | Smart Define. "milestone thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/milestone/thesaurus/synonyms> |