brashness vs gaudiness

brashness and gaudiness both are nouns.

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

As nouns, brashness and gaudiness are synonyms defined as:

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

brashness (noun)	gaudiness (noun)
the trait of being rash and hasty	strident color or excessive ornamentation
tasteless showiness	tasteless showiness