translator vs go-between

translator and go-between both are nouns.

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

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

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

translator (noun)	go-between (noun)
a program that translates one programming language into another	a negotiator who acts as a link between parties
someone who mediates between speakers of different languages
a person who translates written messages from one language to another