rhetoric vs grandiloquence

rhetoric and grandiloquence both are nouns.

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

As nouns, rhetoric and grandiloquence are synonyms defined as:

rhetoric and grandiloquence: high-flown style; excessive use of verbal ornamentation

Other synonyms of rhetoric include grandiosity, magniloquence, ornateness.

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