excitation vs emotional arousal

excitation and emotional arousal both are nouns.

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

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

excitation (noun)	emotional arousal (noun)
something that agitates and arouses	the arousal of strong emotions and emotional behavior
the neural or electrical arousal of an organ or muscle or gland
the state of being emotionally aroused and worked up