excitement vs arousal

excitement and arousal both are nouns.

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

As nouns, arousal is a hypernym of excitement; that is, arousal is a word with a broader meaning than excitement:

Other hypernyms of excitement include rousing.

excitement (noun)	arousal (noun)
something that agitates and arouses	the act of arousing
disturbance usually in protest	mutual sexual fondling prior to sexual intercourse
the feeling of lively and cheerful joy	awakening from sleep
the state of being emotionally aroused and worked up	a state of heightened physiological activity