fifth cranial nerve vs nervus trigeminus

fifth cranial nerve and nervus trigeminus both are nouns.

Word	Noun	Adjective	Verb	Adverb
fifth cranial nerve	Yes	No	No	No
nervus trigeminus	Yes	No	No	No

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

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

Other synonyms of fifth cranial nerve include trigeminal, trigeminal nerve, trigeminus.

fifth cranial nerve (noun)	nervus trigeminus (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