diplomat vs intercessor

diplomat and intercessor both are nouns.

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

As nouns, intercessor is a hypernym of diplomat; that is, intercessor is a word with a broader meaning than diplomat:

Other hypernyms of diplomat include go-between, intermediary, intermediator, mediator.

diplomat (noun)	intercessor (noun)
an official engaged in international negotiations	a negotiator who acts as a link between parties
a person who deals tactfully with others