trochlear nerve vs fourth cranial nerve

trochlear nerve and fourth cranial nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
trochlear nerve	Yes	No	No	No
fourth cranial nerve	Yes	No	No	No

As nouns, trochlear nerve and fourth cranial nerve are synonyms defined as:

trochlear nerve and fourth cranial nerve: either of the two cranial nerves on either side that control the superior oblique muscles of the eyes

Other synonyms of trochlear nerve include trochlear, trochlearis.

trochlear nerve (noun)	fourth cranial nerve (noun)
either of the two cranial nerves on either side that control the superior oblique muscles of the eyes	either of the two cranial nerves on either side that control the superior oblique muscles of the eyes