arouse vs sexual activity

arouse is not a noun while sexual activity is a noun.

Word	Noun	Adjective	Verb	Adverb
arouse	No	No	Yes	No
sexual activity	Yes	No	No	No

arouse (noun)	sexual activity (noun)
	activities associated with sexual intercourse

arouse (verb)	sexual activity (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