early vs primeval

early and primeval both are adjectives.

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

early (adjective)	primeval (adjective)
at or near the beginning of a period of time or course of events or before the usual or expected time	having existed from the beginning; in an earliest or original stage or state
of an early stage in the development of a language or literature
being or occurring at an early stage of development
belonging to the distant past
very young
expected in the near future

early (adverb)	primeval (adverb)
before the usual time or the time expected
during an early stage
in good time