pompousness vs ostentatiousness

pompousness and ostentatiousness both are nouns.

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

As nouns, pompousness and ostentatiousness are synonyms defined as:

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

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

pompousness (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