utter vs intercommunicate

utter is an adjective but intercommunicate is not an adjective.

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

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

Other hypernyms of utter include communicate.

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

utter (verb)	intercommunicate (verb)
express in speech	transmit thoughts or feelings
articulate; either verbally or with a cry, shout, or noise	be interconnected, afford passage
express audibly; utter sounds (not necessarily words)
put into circulation