pretentiousness vs pompousness

pretentiousness and pompousness both are nouns.

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

As nouns, pretentiousness and pompousness are synonyms defined as:

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

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

pretentiousness (noun)	pompousness (noun)
the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)	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