mediator vs intercessor

mediator and intercessor both are nouns.

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

As nouns, mediator and intercessor are synonyms defined as:

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

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

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