autochthonous vs native

autochthonous is not a noun while native is a noun.

Word	Noun	Adjective	Verb	Adverb
autochthonous	No	Yes	No	No
native	Yes	Yes	No	No

autochthonous (noun)	native (noun)
	indigenous plants and animals
	an indigenous person who was born in a particular place
	a person born in a particular place or country

autochthonous (adjective)	native (adjective)
of rocks, deposits, etc.; found where they and their constituents were formed	characteristic of or existing by virtue of geographic origin
originating where it is found	characteristic of or relating to people inhabiting a region from the beginning
	belonging to one by birth
	as found in nature in the elemental form