empty talk vs hokum

empty talk and hokum both are nouns.

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

As nouns, hokum is a hypernym of empty talk; that is, hokum is a word with a broader meaning than empty talk:

Other hypernyms of empty talk include bunk, meaninglessness, nonsense, nonsensicality.

empty talk (noun)	hokum (noun)
loud and confused and empty talk	a message that seems to convey no meaning