flashiness vs gaudiness

flashiness and gaudiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
flashiness	Yes	No	No	No
gaudiness	Yes	No	No	No

As nouns, flashiness and gaudiness are synonyms defined as:

Other synonyms of flashiness include brashness, garishness, glitz, loudness, meretriciousness, tawdriness.

flashiness (noun)	gaudiness (noun)
tasteless showiness	strident color or excessive ornamentation
	tasteless showiness