flatten vs music

flatten is not a noun while music is a noun.

Word	Noun	Adjective	Verb	Adverb
flatten	No	No	Yes	No
music	Yes	No	No	No

flatten (noun)	music (noun)
	musical activity (singing or whistling etc.)
	punishment for one's actions
	any agreeable (pleasing and harmonious) sounds
	(music) the sounds produced by singers or musical instruments (or reproductions of such sounds)
	an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner

flatten (verb)	music (verb)
become flat or flatter
make flat or flatter
lower the pitch of (musical notes)