brainstem vs neural structure

brainstem and neural structure both are nouns.

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

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

brainstem: the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus
neural structure: a structure that is part of the nervous system

brainstem (noun)	neural structure (noun)
the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus	a structure that is part of the nervous system