medial rectus vs ocular muscle

medial rectus and ocular muscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
medial rectus	Yes	No	No	No
ocular muscle	Yes	No	No	No

As nouns, ocular muscle is a hypernym of medial rectus; that is, ocular muscle is a word with a broader meaning than medial rectus:

medial rectus: the ocular muscle whose contraction turns the eyeball medially
ocular muscle: one of the small muscles of the eye that serve to rotate the eyeball

Other hypernyms of medial rectus include eye muscle.

medial rectus (noun)	ocular muscle (noun)
the ocular muscle whose contraction turns the eyeball medially	one of the small muscles of the eye that serve to rotate the eyeball