arousal vs innervation

arousal and innervation both are nouns.

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

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

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

Other hyponyms of arousal include alerting, alertness, emotional arousal, excitation, irritation, sexual arousal, desire.

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