hemisphere vs neural structure

hemisphere and neural structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
hemisphere	Yes	No	No	No
neural structure	Yes	No	No	No

As nouns, neural structure is a hypernym of hemisphere; that is, neural structure is a word with a broader meaning than hemisphere:

hemisphere (noun)	neural structure (noun)
either half of the cerebrum	a structure that is part of the nervous system
half of the terrestrial globe
half of a sphere