rhetoric vs grandiosity

rhetoric and grandiosity both are nouns.

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

As nouns, rhetoric and grandiosity are synonyms defined as:

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

Other synonyms of rhetoric include grandiloquence, magniloquence, ornateness.

rhetoric (noun)	grandiosity (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