primal vs primeval

primal and primeval both are adjectives.

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

As adjectives, primal and primeval are synonyms defined as:

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

Other synonyms of primal include aboriginal, primaeval, primordial.

primal (adjective)	primeval (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