mediator vs intermediator

mediator and intermediator both are nouns.

Word	Noun	Adjective	Verb	Adverb
mediator	Yes	No	No	No
intermediator	Yes	No	No	No

As nouns, mediator and intermediator are synonyms defined as:

mediator and intermediator: a negotiator who acts as a link between parties

Other synonyms of mediator include go-between, intercessor, intermediary.

mediator (noun)	intermediator (noun)
a negotiator who acts as a link between parties	a negotiator who acts as a link between parties