grandiloquence vs grandiosity

grandiloquence and grandiosity both are nouns.

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

As nouns, grandiloquence and grandiosity are synonyms defined as:

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

Other synonyms of grandiloquence include magniloquence, ornateness, rhetoric.

grandiloquence (noun)	grandiosity (noun)
high-flown style; excessive use of verbal ornamentation	high-flown style; excessive use of verbal ornamentation