interpreter vs intermediary

interpreter and intermediary both are nouns.

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

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

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

interpreter (noun)	intermediary (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