rant vs rhetoric

rant and rhetoric both are nouns.

Word	Noun	Adjective	Verb	Adverb
rant	Yes	No	Yes	No
rhetoric	Yes	No	No	No

As nouns, rhetoric is a hypernym of rant; that is, rhetoric is a word with a broader meaning than rant:

Other hypernyms of rant include grandiloquence, grandiosity, magniloquence, ornateness.

rant (noun)	rhetoric (noun)
pompous or pretentious talk or writing	study of the technique and rules for using language effectively (especially in public speaking)
a loud bombastic declamation expressed with strong emotion	using language effectively to please or persuade
	high-flown style; excessive use of verbal ornamentation
	loud and confused and empty talk

rant (verb)	rhetoric (verb)
talk in a noisy, excited, or declamatory manner