innervation vs arousal

innervation and arousal both are nouns.

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

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

innervation: the neural or electrical arousal of an organ or muscle or gland
arousal: a state of heightened physiological activity

innervation (noun)	arousal (noun)
the distribution of nerve fibers to an organ or body region	the act of arousing
the neural or electrical arousal of an organ or muscle or gland	mutual sexual fondling prior to sexual intercourse
	awakening from sleep
	a state of heightened physiological activity