piffle vs utter

piffle is a noun but utter is not a noun.

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

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

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

piffle (noun)	utter (noun)
trivial nonsense

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

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