primaeval vs aboriginal

primaeval is not a noun while aboriginal is a noun.

Word	Noun	Adjective	Verb	Adverb
primaeval	No	Yes	No	No
aboriginal	Yes	Yes	No	No

As adjectives, primaeval and aboriginal are synonyms defined as:

primaeval and aboriginal: having existed from the beginning; in an earliest or original stage or state

Other synonyms of primaeval include primal, primeval, primordial.

primaeval (noun)	aboriginal (noun)
	an indigenous person who was born in a particular place

primaeval (adjective)	aboriginal (adjective)
having existed from the beginning; in an earliest or original stage or state	characteristic of or relating to people inhabiting a region from the beginning
	having existed from the beginning; in an earliest or original stage or state