interpreter vs mediator

interpreter and mediator both are nouns.

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

As nouns, mediator is a hypernym of interpreter; that is, mediator is a word with a broader meaning than interpreter:

Other hypernyms of interpreter include go-between, intercessor, intermediary, intermediator.

interpreter (noun)	mediator (noun)
(computer science) a program that translates and executes source language statements one line at a time	a negotiator who acts as a link between parties
an advocate who represents someone else's policy or purpose
someone who mediates between speakers of different languages
someone who uses art to represent something