first cranial nerve vs olfactory nerve

first cranial nerve and olfactory nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
first cranial nerve	Yes	No	No	No
olfactory nerve	Yes	No	No	No

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

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

Other synonyms of first cranial nerve include nervii olfactorii.

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