aboriginal vs primaeval

aboriginal is a noun but primaeval is not a noun.

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

As adjectives, aboriginal and primaeval are synonyms defined as:

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

Other synonyms of aboriginal include primal, primeval, primordial.

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

aboriginal (adjective)	primaeval (adjective)
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
having existed from the beginning; in an earliest or original stage or state