extinction vs extinct

extinction is a noun but extinct is not a noun.

Word	Noun	Adjective	Verb	Adverb
extinction	Yes	No	No	No
extinct	No	Yes	No	No

extinction (noun)	extinct (noun)
the act of extinguishing; causing to stop burning
a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
complete annihilation
the reduction of the intensity of radiation as a consequence of absorption and radiation
no longer in existence
no longer active; extinguished

extinction (adjective)	extinct (adjective)
	no longer in existence; lost or especially having died out leaving no living representatives
	(of e.g. volcanoes) permanently inactive
	being out or having grown cold