endemism vs autochthony

endemism and autochthony both are nouns.

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

As nouns, endemism and autochthony are synonyms defined as:

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

Other synonyms of endemism include indigenousness.

endemism (noun)	autochthony (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)