pomposity vs ostentatiousness

pomposity and ostentatiousness both are nouns.

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

As nouns, pomposity and ostentatiousness are synonyms defined as:

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

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

pomposity (noun)	ostentatiousness (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