brainstem vs pons Varolii

brainstem and pons Varolii both are nouns.

Word	Noun	Adjective	Verb	Adverb
brainstem	Yes	No	No	No
pons Varolii	Yes	No	No	No

brainstem (noun)	pons Varolii (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 band of nerve fibers linking the medulla oblongata and the cerebellum with the midbrain