excitation vs arousal

excitation and arousal both are nouns.

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

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

Other hypernyms of excitation include rousing.

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

excitation (noun)	arousal (noun)
something that agitates and arouses	the act of arousing
the neural or electrical arousal of an organ or muscle or gland	mutual sexual fondling prior to sexual intercourse
the state of being emotionally aroused and worked up	awakening from sleep
	a state of heightened physiological activity