dark glasses vs eyeglasses

dark glasses and eyeglasses both are nouns.

Word	Noun	Adjective	Verb	Adverb
dark glasses	Yes	No	No	No
eyeglasses	Yes	No	No	No

As nouns, eyeglasses is a hypernym of dark glasses; that is, eyeglasses is a word with a broader meaning than dark glasses:

dark glasses: (plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun
eyeglasses: (plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision

Other hypernyms of dark glasses include glasses, specs, spectacles.

dark glasses (noun)	eyeglasses (noun)
(plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun	(plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision