Broca's center vs nerve center

Broca's center and nerve center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Broca's center	Yes	No	No	No
nerve center	Yes	No	No	No

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

Broca's center: the motor speech center in the left hemisphere of the brain in most people
nerve center: a cluster of nerve cells governing a specific bodily process

Other hypernyms of Broca's center include center, centre, nerve centre.

Broca's center (noun)	nerve center (noun)
the motor speech center in the left hemisphere of the brain in most people	a cluster of nerve cells governing a specific bodily process
	a center that provides information and control