glaucoma vs eye disease

glaucoma and eye disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
glaucoma	Yes	No	No	No
eye disease	Yes	No	No	No

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

glaucoma: an eye disease that damages the optic nerve and impairs vision (sometimes progressing to blindness)
eye disease: any disease of the eye

glaucoma (noun)	eye disease (noun)
an eye disease that damages the optic nerve and impairs vision (sometimes progressing to blindness)	any disease of the eye