gabble vs utter

gabble is a noun but utter is not a noun.

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

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

Other hypernyms of gabble include mouth, speak, talk, verbalise, verbalize.

gabble (noun)	utter (noun)
rapid and indistinct speech

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

gabble (verb)	utter (verb)
speak (about unimportant matters) rapidly and incessantly	express in speech
	articulate; either verbally or with a cry, shout, or noise
	express audibly; utter sounds (not necessarily words)
	put into circulation