4
remains(adjective, corpse)
4
specimen(noun, verb, time, remains)
4
superannuated(dead, tired, old, gray, mature)
3
stick-in-the-mud(noun, person, informal, new)
3
obsolete(adjective, vogue)
3
old(adjective, dead, age, venerable, antique)
3
stromatolite
3
deposit(noun, time)
3
eolith(noun, time)
3
mossback(noun, new)
3
neolith(noun, time)
3
paleolith(noun, time)
3
petrified
3
reconstruction(noun, verb, time, remains)
3
skeleton(noun, verb, time, remains)
2
conservative
2
back number
2
adamant(adjective, hardness)
2
along in years(expression, tired, gray, mature, aged)
2
ammonite
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APASmart Define. (2015). fossil thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fossil/thesaurus/synonyms
ChicagoSmart Define. 2015. "fossil thesaurus" https://smartdefine.org/fossil/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, fossil thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fossil/thesaurus/synonyms>.
MLASmart Define. "fossil thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/fossil/thesaurus/synonyms>