ornateness vs grandiosity

ornateness and grandiosity both are nouns.

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

As nouns, ornateness and grandiosity are synonyms defined as:

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

Other synonyms of ornateness include grandiloquence, magniloquence, rhetoric.

ornateness (noun)	grandiosity (noun)
an ornate appearance; being elaborately (even excessively) decorated	high-flown style; excessive use of verbal ornamentation
high-flown style; excessive use of verbal ornamentation