telepathist vs communicator

telepathist and communicator both are nouns.

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

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

telepathist (noun)	communicator (noun)
someone with the power of communicating thoughts directly	a person who communicates with others
a magician who seems to discern the thoughts of another person (usually by clever signals from an accomplice)