rhinencephalon vs nerve center

rhinencephalon and nerve center both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhinencephalon	Yes	No	No	No
nerve center	Yes	No	No	No

As nouns, nerve center is a hypernym of rhinencephalon; that is, nerve center is a word with a broader meaning than rhinencephalon:

rhinencephalon: a center in the cerebral hemispheres that governs the sense of smell in lower animals; in humans it seems to mediate complex emotional behavior
nerve center: a cluster of nerve cells governing a specific bodily process

Other hypernyms of rhinencephalon include center, centre, nerve centre.

rhinencephalon (noun)	nerve center (noun)
a center in the cerebral hemispheres that governs the sense of smell in lower animals; in humans it seems to mediate complex emotional behavior	a cluster of nerve cells governing a specific bodily process
	a center that provides information and control