wide screen vs silver screen

wide screen and silver screen both are nouns.

Word	Noun	Adjective	Verb	Adverb
wide screen	Yes	No	No	No
silver screen	Yes	No	No	No

As nouns, silver screen is a hypernym of wide screen; that is, silver screen is a word with a broader meaning than wide screen:

wide screen: a projection screen that is much wider than it is high
silver screen: a white or silvered surface where pictures can be projected for viewing

Other hypernyms of wide screen include projection screen, screen.

wide screen (noun)	silver screen (noun)
a projection screen that is much wider than it is high	a white or silvered surface where pictures can be projected for viewing
	the film industry