primordial vs primaeval

primordial and primaeval both are adjectives.

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

As adjectives, primordial and primaeval are synonyms defined as:

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

Other synonyms of primordial include aboriginal, primal, primeval.

primordial (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