arousal vs excitation

arousal and excitation both are nouns.

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

As nouns, excitation is a hyponym of arousal; that is, excitation is a word with a more specific, narrower meaning than arousal:

As nouns, excitation is a hyponym of arousal; that is, excitation is a word with a more specific, narrower meaning than arousal:

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