empty talk vs hot air

empty talk and hot air both are nouns.

Word	Noun	Adjective	Verb	Adverb
empty talk	Yes	No	No	No
hot air	Yes	No	No	No

As nouns, empty talk and hot air are synonyms defined as:

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

empty talk (noun)	hot air (noun)
loud and confused and empty talk	loud and confused and empty talk
	air that has been heated and tends to rise