touchscreen vs computer screen

touchscreen and computer screen both are nouns.

Word	Noun	Adjective	Verb	Adverb
touchscreen	Yes	No	No	No
computer screen	Yes	No	No	No

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

touchscreen: a computer display that enables the user to interact with the computer by touching areas on the screen
computer screen: a screen used to display the output of a computer to the user

Other hypernyms of touchscreen include computer display.

touchscreen (noun)	computer screen (noun)
a computer display that enables the user to interact with the computer by touching areas on the screen	a screen used to display the output of a computer to the user