musculus sphincter pupillae vs pupillary sphincter

musculus sphincter pupillae and pupillary sphincter both are nouns.

Word	Noun	Adjective	Verb	Adverb
musculus sphincter pupillae	Yes	No	No	No
pupillary sphincter	Yes	No	No	No

As nouns, musculus sphincter pupillae and pupillary sphincter are synonyms defined as:

musculus sphincter pupillae and pupillary sphincter: a ring of smooth muscle surrounding the iris

musculus sphincter pupillae (noun)	pupillary sphincter (noun)
a ring of smooth muscle surrounding the iris	a ring of smooth muscle surrounding the iris