| remains(adjective, corpse) | |
| specimen(noun, verb, time, remains) | |
| superannuated(dead, tired, old, gray, mature) | |
| stick-in-the-mud(noun, person, informal, new) | |
| obsolete(adjective, vogue) | |
| old(adjective, dead, age, venerable, antique) | |
| stromatolite | |
| deposit(noun, time) | |
| eolith(noun, time) | |
| mossback(noun, new) | |
| neolith(noun, time) | |
| paleolith(noun, time) | |
| petrified | |
| reconstruction(noun, verb, time, remains) | |
| skeleton(noun, verb, time, remains) | |
| conservative | |
| back number | |
| adamant(adjective, hardness) | |
| along in years(expression, tired, gray, mature, aged) | |
| ammonite |
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| APA | Smart Define. (2015). fossil thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fossil/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fossil thesaurus" https://smartdefine.org/fossil/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, fossil thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fossil/thesaurus/synonyms>. |
| MLA | Smart Define. "fossil thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/fossil/thesaurus/synonyms> |