utter vs communicate

utter is an adjective but communicate is not an adjective.

Word	Noun	Adjective	Verb	Adverb
utter	No	Yes	Yes	No
communicate	No	No	Yes	No

As verbs, communicate is a hypernym of utter; that is, communicate is a word with a broader meaning than utter:

Other hypernyms of utter include intercommunicate.

utter (adjective)	communicate (adjective)
complete and absolute
without qualification; used informally as (often pejorative) intensifiers

utter (verb)	communicate (verb)
express in speech	transmit thoughts or feelings
articulate; either verbally or with a cry, shout, or noise	transmit information
express audibly; utter sounds (not necessarily words)	be in verbal contact; interchange information or ideas
put into circulation	receive Communion, in the Catholic church
	administer Communion; in church
	join or connect
	transfer to another