autochthony vs endemism

autochthony and endemism both are nouns.

Word	Noun	Adjective	Verb	Adverb
autochthony	Yes	No	No	No
endemism	Yes	No	No	No

As nouns, autochthony and endemism are synonyms defined as:

autochthony and endemism: nativeness by virtue of originating or occurring naturally (as in a particular place)

Other synonyms of autochthony include indigenousness.

autochthony (noun)	endemism (noun)
nativeness by virtue of originating or occurring naturally (as in a particular place)	nativeness by virtue of originating or occurring naturally (as in a particular place)