hot air vs rhetoric

hot air and rhetoric both are nouns.

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

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

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

hot air (noun)	rhetoric (noun)
loud and confused and empty talk	study of the technique and rules for using language effectively (especially in public speaking)
air that has been heated and tends to rise	using language effectively to please or persuade
	high-flown style; excessive use of verbal ornamentation
	loud and confused and empty talk