gabble vs speak

gabble is a noun but speak is not a noun.

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

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

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

gabble (noun)	speak (noun)
rapid and indistinct speech

gabble (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