extinct vs nonexistent

extinct and nonexistent both are adjectives.

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

extinct (adjective)	nonexistent (adjective)
no longer in existence; lost or especially having died out leaving no living representatives	not having existence or being or actuality
(of e.g. volcanoes) permanently inactive
being out or having grown cold