yap away vs speak

yap away and speak both are verbs.

Word	Noun	Adjective	Verb	Adverb
yap away	No	No	Yes	No
speak	No	No	Yes	No

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

Other hypernyms of yap away include mouth, talk, utter, verbalise, verbalize.

yap away (verb)	speak (verb)
talk incessantly and tiresomely	express in speech
	exchange thoughts; talk with
	use language
	give a speech to
	make a characteristic or natural sound