respondent vs communicator

respondent and communicator both are nouns.

Word	Noun	Adjective	Verb	Adverb
respondent	Yes	Yes	No	No
communicator	Yes	No	No	No

As nouns, communicator is a hypernym of respondent; that is, communicator is a word with a broader meaning than respondent:

respondent (noun)	communicator (noun)
someone who responds	a person who communicates with others
the codefendant (especially in a divorce proceeding) who is accused of adultery with the corespondent

respondent (adjective)	communicator (adjective)
replying