moderator vs go-between

moderator and go-between both are nouns.

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

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

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

moderator (noun)	go-between (noun)
someone who mediates disputes and attempts to avoid violence	a negotiator who acts as a link between parties
someone who presides over a forum or debate
in the Presbyterian church, the officer who presides over a synod or general assembly
any substance used to slow down neutrons in nuclear reactors