piffle vs speak

piffle is a noun but speak is not a noun.

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

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

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

piffle (noun)	speak (noun)
trivial nonsense

piffle (verb)	speak (verb)
act in a trivial or ineffective way	express in speech
speak (about unimportant matters) rapidly and incessantly	exchange thoughts; talk with
	use language
	give a speech to
	make a characteristic or natural sound