rhetoric vs hot air

rhetoric and hot air both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhetoric	Yes	No	No	No
hot air	Yes	No	No	No

As nouns, rhetoric and hot air are synonyms defined as:

Other synonyms of rhetoric include empty talk, empty words, palaver.

rhetoric (noun)	hot air (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	air that has been heated and tends to rise
high-flown style; excessive use of verbal ornamentation
loud and confused and empty talk