peacemaker vs go-between

peacemaker and go-between both are nouns.

Word	Noun	Adjective	Verb	Adverb
peacemaker	Yes	No	No	No
go-between	Yes	No	No	No

As nouns, go-between is a hypernym of peacemaker; that is, go-between is a word with a broader meaning than peacemaker:

Other hypernyms of peacemaker include intercessor, intermediary, intermediator, mediator.

peacemaker (noun)	go-between (noun)
someone who tries to bring peace	a negotiator who acts as a link between parties