arousal vs arouse

arousal is a noun but arouse is not a noun.

Word	Noun	Adjective	Verb	Adverb
arousal	Yes	No	No	No
arouse	No	No	Yes	No

arousal (noun)	arouse (noun)
the act of arousing
mutual sexual fondling prior to sexual intercourse
awakening from sleep
a state of heightened physiological activity

arousal (verb)	arouse (verb)
	cause to be alert and energetic
	cause to become awake or conscious
	stop sleeping
	summon into action or bring into existence, often as if by magic
	call forth (emotions, feelings, and responses)
	to evoke sexual feelings
	to begin moving