flashiness vs garishness

flashiness and garishness both are nouns.

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

As nouns, flashiness and garishness are synonyms defined as:

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

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