CRT screen vs video display

CRT screen and video display both are nouns.

Word	Noun	Adjective	Verb	Adverb
CRT screen	Yes	No	No	No
video display	Yes	No	No	No

As nouns, video display is a hypernym of CRT screen; that is, video display is a word with a broader meaning than CRT screen:

CRT screen: the display that is electronically created on the surface of the large end of a cathode-ray tube
video display: an electronic device that represents information in visual form

Other hypernyms of CRT screen include display.

CRT screen (noun)	video display (noun)
the display that is electronically created on the surface of the large end of a cathode-ray tube	an electronic device that represents information in visual form