music vs flatten

music is a noun but flatten is not a noun.

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

music (noun)	flatten (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

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