display board vs video display

display board and video display both are nouns.

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

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

display board: a vertical surface on which information can be displayed to public view
video display: an electronic device that represents information in visual form

Other hypernyms of display board include display.

display board (noun)	video display (noun)
a vertical surface on which information can be displayed to public view	an electronic device that represents information in visual form