facial vs cranial nerve

facial and cranial nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
facial	Yes	Yes	No	No
cranial nerve	Yes	No	No	No

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

facial (noun)	cranial nerve (noun)
care for the face that usually involves cleansing and massage and the application of cosmetic creams	any of the 12 paired nerves that originate in the brain stem
cranial nerve that supplies facial muscles

facial (adjective)	cranial nerve (adjective)
of or concerning the face
of or pertaining to the outside surface of an object