rhetoric vs claptrap

rhetoric and claptrap both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhetoric	Yes	No	No	No
claptrap	Yes	No	No	No

As nouns, claptrap is a hyponym of rhetoric; that is, claptrap is a word with a more specific, narrower meaning than rhetoric:

Other hyponyms of rhetoric include flourish, blah, bombast, fustian, rant.

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