rhetoric vs rant

rhetoric and rant both are nouns.

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

As nouns, rant is a hyponym of rhetoric; that is, rant is a word with a more specific, narrower meaning than rhetoric:

Other hyponyms of rhetoric include flourish, blah, bombast, claptrap, fustian.

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

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