nonexistent vs nonextant

nonexistent and nonextant both are adjectives.

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

nonexistent (adjective)	nonextant (adjective)
not having existence or being or actuality	no longer in existence; lost or especially having died out leaving no living representatives
	no longer existing or inaccessible through loss or destruction