glass eye vs prosthetic device

glass eye and prosthetic device both are nouns.

Word	Noun	Adjective	Verb	Adverb
glass eye	Yes	No	No	No
prosthetic device	Yes	No	No	No

As nouns, prosthetic device is a hypernym of glass eye; that is, prosthetic device is a word with a broader meaning than glass eye:

glass eye: prosthesis consisting of an artificial eye made of glass
prosthetic device: corrective consisting of a replacement for a part of the body

Other hypernyms of glass eye include prosthesis.

glass eye (noun)	prosthetic device (noun)
prosthesis consisting of an artificial eye made of glass	corrective consisting of a replacement for a part of the body