dark glasses vs shades

dark glasses and shades both are nouns.

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

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

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

Other synonyms of dark glasses include sunglasses.

dark glasses (noun)	shades (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
	(plural) something that reminds you of someone or something