twaddle vs speak

twaddle is a noun but speak is not a noun.

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

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

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

twaddle (noun)	speak (noun)
pretentious or silly talk or writing

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