lip off vs utter

lip off is not an adjective while utter is an adjective.

Word	Noun	Adjective	Verb	Adverb
lip off	No	No	Yes	No
utter	No	Yes	Yes	No

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

Other hypernyms of lip off include mouth, speak, talk, verbalise, verbalize.

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

lip off (verb)	utter (verb)
speak spontaneously and without restraint	express in speech
	articulate; either verbally or with a cry, shout, or noise
	express audibly; utter sounds (not necessarily words)
	put into circulation