loudness vs brashness

loudness and brashness both are nouns.

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

As nouns, loudness and brashness are synonyms defined as:

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

loudness (noun)	brashness (noun)
the magnitude of sound (usually in a specified direction)	the trait of being rash and hasty
tasteless showiness	tasteless showiness