rattle on vs speak

rattle on and speak both are verbs.

Word	Noun	Adjective	Verb	Adverb
rattle on	No	No	Yes	No
speak	No	No	Yes	No

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

Other hypernyms of rattle on include mouth, talk, utter, verbalise, verbalize.

rattle on (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