primal vs primaeval

primal and primaeval both are adjectives.

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

As adjectives, primal and primaeval are synonyms defined as:

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

Other synonyms of primal include aboriginal, primeval, primordial.

primal (adjective)	primaeval (adjective)
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
serving as an essential component