ostentatiousness vs pomposity

ostentatiousness and pomposity both are nouns.

Word	Noun	Adjective	Verb	Adverb
ostentatiousness	Yes	No	No	No
pomposity	Yes	No	No	No

As nouns, ostentatiousness and pomposity are synonyms defined as:

ostentatiousness and pomposity: lack of elegance as a consequence of being pompous and puffed up with vanity

Other synonyms of ostentatiousness include inflation, ostentation, pompousness, pretentiousness, puffiness, splashiness.

ostentatiousness (noun)	pomposity (noun)
lack of elegance as a consequence of being pompous and puffed up with vanity	lack of elegance as a consequence of being pompous and puffed up with vanity