repeat vs utter

repeat is a noun but utter is not a noun.

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

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

Other hypernyms of repeat include emit, let loose, let out.

repeat (noun)	utter (noun)
an event that repeats

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

repeat (verb)	utter (verb)
happen or occur again	express in speech
to say, state, or perform again	articulate; either verbally or with a cry, shout, or noise
to say again or imitate	express audibly; utter sounds (not necessarily words)
make or do or perform again	put into circulation
repeat an earlier theme of a composition
do over