first cranial nerve vs nervii olfactorii

first cranial nerve and nervii olfactorii both are nouns.

Word	Noun	Adjective	Verb	Adverb
first cranial nerve	Yes	No	No	No
nervii olfactorii	Yes	No	No	No

As nouns, first cranial nerve and nervii olfactorii are synonyms defined as:

first cranial nerve and nervii olfactorii: a collective term for numerous olfactory filaments in the nasal mucosa

Other synonyms of first cranial nerve include olfactory nerve.

first cranial nerve (noun)	nervii olfactorii (noun)
a collective term for numerous olfactory filaments in the nasal mucosa	a collective term for numerous olfactory filaments in the nasal mucosa