equal vs coeval

equal and coeval both are nouns.

Word	Noun	Adjective	Verb	Adverb
equal	Yes	Yes	Yes	No
coeval	Yes	Yes	No	No

As nouns, coeval is a hyponym of equal; that is, coeval is a word with a more specific, narrower meaning than equal:

equal (noun)	coeval (noun)
a person who is of equal standing with another in a group	a person of nearly the same age as another

equal (adjective)	coeval (adjective)
having the same quantity, value, or measure as another	of the same period
having the requisite qualities or resources to meet a task

equal (verb)	coeval (verb)
make equal, uniform, corresponding, or matching
be identical or equivalent to
be equal to in quality or ability