empty talk vs rhetoric

empty talk and rhetoric both are nouns.

Word	Noun	Adjective	Verb	Adverb
empty talk	Yes	No	No	No
rhetoric	Yes	No	No	No

As nouns, empty talk and rhetoric are synonyms defined as:

Other synonyms of empty talk include empty words, hot air, palaver.

empty talk (noun)	rhetoric (noun)
loud and confused and empty talk	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