compound eye vs oculus

compound eye and oculus both are nouns.

Word	Noun	Adjective	Verb	Adverb
compound eye	Yes	No	No	No
oculus	Yes	No	No	No

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

compound eye: in insects and some crustaceans: composed of many light-sensitive elements each forming a portion of an image
oculus: the organ of sight

Other hypernyms of compound eye include eye, optic.

compound eye (noun)	oculus (noun)
in insects and some crustaceans: composed of many light-sensitive elements each forming a portion of an image	the organ of sight