fourth cranial nerve vs trochlear nerve

fourth cranial nerve and trochlear nerve both are nouns.

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

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

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

Other synonyms of fourth cranial nerve include trochlear, trochlearis.

fourth cranial nerve (noun)	trochlear 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