photochromic glasses vs shades

photochromic glasses and shades both are nouns.

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

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

photochromic glasses: Any eyeglasses with photochromic lenses with darken when exposed to sunlight.
shades: (plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun

Other hypernyms of photochromic glasses include dark glasses, sunglasses.

photochromic glasses (noun)	shades (noun)
Any eyeglasses with photochromic lenses with darken when exposed to sunlight.	(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