peer group vs coevals

peer group and coevals both are nouns.

Word	Noun	Adjective	Verb	Adverb
peer group	Yes	No	No	No
coevals	Yes	No	No	No

As nouns, coevals is a hypernym of peer group; that is, coevals is a word with a broader meaning than peer group:

peer group: contemporaries of the same status
coevals: all the people living at the same time or of approximately the same age

Other hypernyms of peer group include contemporaries, generation.

peer group (noun)	coevals (noun)
contemporaries of the same status	all the people living at the same time or of approximately the same age