blunder vs utter

blunder is a noun but utter is not a noun.

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

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

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

blunder (noun)	utter (noun)
an embarrassing mistake

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

blunder (verb)	utter (verb)
utter impulsively	express in speech
make one's way clumsily or blindly	articulate; either verbally or with a cry, shout, or noise
commit a faux pas or a fault or make a serious mistake	express audibly; utter sounds (not necessarily words)
	put into circulation