VDU vs video display

VDU and video display both are nouns.

Word	Noun	Adjective	Verb	Adverb
VDU	Yes	No	No	No
video display	Yes	No	No	No

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

VDU: (British) British term for video display
video display: an electronic device that represents information in visual form

Other hypernyms of VDU include display.

VDU (noun)	video display (noun)
(British) British term for video display	an electronic device that represents information in visual form