| once | |
| formerly | |
| ago | |
| animal group | |
| at one time | |
| before | |
| beforetime | |
| collective noun | |
| earlier | |
| erewhile | |
| erstwhile | |
| heretofore | |
| historically | |
| hitherto | |
| over | |
| previously | |
| recently | |
| then | |
| was | |
| whilom |
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| APA | Smart Define. (2015). erst thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/erst/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "erst thesaurus" https://smartdefine.org/erst/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, erst thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/erst/thesaurus/synonyms>. |
| MLA | Smart Define. "erst thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/erst/thesaurus/synonyms> |