arouse vs arousal

arouse is not a noun while arousal is a noun.

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

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

arouse (verb)	arousal (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