rhetoric vs empty words

rhetoric and empty words both are nouns.

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

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

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

rhetoric (noun)	empty words (noun)
study of the technique and rules for using language effectively (especially in public speaking)	loud and confused and empty talk
using language effectively to please or persuade
high-flown style; excessive use of verbal ornamentation
loud and confused and empty talk