trigeminal vs fifth cranial nerve

trigeminal and fifth cranial nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
trigeminal	Yes	No	No	No
fifth cranial nerve	Yes	No	No	No

As nouns, trigeminal and fifth cranial nerve are synonyms defined as:

trigeminal and fifth cranial nerve: the main sensory nerve of the face and motor nerve for the muscles of mastication

Other synonyms of trigeminal include nervus trigeminus, trigeminal nerve, trigeminus.

trigeminal (noun)	fifth cranial nerve (noun)
the main sensory nerve of the face and motor nerve for the muscles of mastication	the main sensory nerve of the face and motor nerve for the muscles of mastication