dark glasses vs sunglasses

dark glasses and sunglasses both are nouns.

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

As nouns, dark glasses and sunglasses are synonyms defined as:

dark glasses and sunglasses: (plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun

Other synonyms of dark glasses include shades.

dark glasses (noun)	sunglasses (noun)
(plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun	(plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun