rhetorical device vs rhetoric

rhetorical device and rhetoric both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhetorical device	Yes	No	No	No
rhetoric	Yes	No	No	No

rhetorical device (noun)	rhetoric (noun)
a use of language that creates a literary effect (but often without regard for literal significance)	study of the technique and rules for using language effectively (especially in public speaking)
	using language effectively to please or persuade
	high-flown style; excessive use of verbal ornamentation
	loud and confused and empty talk