reliever vs compeer

reliever and compeer both are nouns.

Word	Noun	Adjective	Verb	Adverb
reliever	Yes	No	No	No
compeer	Yes	No	No	No

As nouns, compeer is a hypernym of reliever; that is, compeer is a word with a broader meaning than reliever:

reliever: someone who takes the place of another (as when things get dangerous or difficult)
compeer: a person who is of equal standing with another in a group

Other hypernyms of reliever include equal, match, peer.

reliever (noun)	compeer (noun)
a pitcher who does not start the game	a person who is of equal standing with another in a group
someone who takes the place of another (as when things get dangerous or difficult)
a person who reduces the intensity (e.g., of fears) and calms and pacifies