loudness vs flashiness

loudness and flashiness both are nouns.

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

As nouns, loudness and flashiness are synonyms defined as:

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

loudness (noun)	flashiness (noun)
the magnitude of sound (usually in a specified direction)	tasteless showiness
tasteless showiness