decreasing vs music

decreasing is not a noun while music is a noun.

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

decreasing (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

decreasing (adjective)	music (adjective)
becoming less or smaller
(music) decreasing in tempo and/or volume