haw vs utter

haw is a noun but utter is not a noun.

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

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

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

haw (noun)	utter (noun)
the nictitating membrane of a horse
a spring-flowering shrub or small tree of the genus Crataegus

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

haw (verb)	utter (verb)
utter `haw'	express in speech
	articulate; either verbally or with a cry, shout, or noise
	express audibly; utter sounds (not necessarily words)
	put into circulation