eye muscle vs musculus

eye muscle and musculus both are nouns.

Word	Noun	Adjective	Verb	Adverb
eye muscle	Yes	No	No	No
musculus	Yes	No	No	No

As nouns, musculus is a hypernym of eye muscle; that is, musculus is a word with a broader meaning than eye muscle:

eye muscle: one of the small muscles of the eye that serve to rotate the eyeball
musculus: one of the contractile organs of the body

Other hypernyms of eye muscle include muscle.

eye muscle (noun)	musculus (noun)
one of the small muscles of the eye that serve to rotate the eyeball	one of the contractile organs of the body