2
antiquated(adjective, feature, characteristic, trait, death)
2
biogeography(noun, science, learning, mastery, proficiency)
2
ceased(adjective, feature, characteristic, detail)
2
conservation dependent(expression, species, classification, status)
2
critically endangered(expression, species, classification, status)
2
data deficient(expression, species, classification, status)
2
defunct(adjective, feature, characteristic, trait, death)
2
departed(adjective, feature, characteristic, trait, death)
2
died(adjective, feature, characteristic, detail)
2
disabled(adjective, feature, characteristic, detail)
2
dull(adjective, feature, characteristic, trait)
2
elapsed(adjective, feature, characteristic, detail)
2
flat(adjective, feature, characteristic, trait)
2
habitat(noun, science, learning, mastery, proficiency)
2
inanimate(adjective, feature, characteristic, trait)
2
inert(adjective, feature, characteristic, trait)
2
insipid(adjective, feature, characteristic, trait)
2
invalid(adjective, feature, characteristic, detail)
2
lapsed(adjective, feature, characteristic, detail)
2
last(adjective, feature, characteristic, detail)
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APASmart Define. (1970). extinct species thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/extinct_species/thesaurus/related
ChicagoSmart Define. 1970. "extinct species thesaurus" https://smartdefine.org/extinct_species/thesaurus/related (accessed September 29, 2026).
HarvardSmart Define 1970, extinct species thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/extinct_species/thesaurus/related>.
MLASmart Define. "extinct species thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/extinct_species/thesaurus/related>