rhetoric vs rhetorical

rhetoric is a noun but rhetorical is not a noun.

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

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

rhetoric (adjective)	rhetorical (adjective)
	given to rhetoric, emphasizing style at the expense of thought
	of or relating to rhetoric