ostentatiousness vs pompousness

ostentatiousness and pompousness both are nouns.

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

As nouns, ostentatiousness and pompousness are synonyms defined as:

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

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

ostentatiousness (noun)	pompousness (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