viewing vs display

viewing and display both are nouns.

Word	Noun	Adjective	Verb	Adverb
viewing	Yes	No	No	No
display	Yes	No	Yes	No

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

viewing (noun)	display (noun)
a vigil held over a corpse the night before burial	something shown to the public
the display of a motion picture	a visual representation of something
	an electronic device that represents information in visual form
	exhibiting openly in public view
	something intended to communicate a particular impression
	behavior that makes your feelings public

viewing (verb)	display (verb)
	to show, make visible or apparent
	attract attention by displaying some body part or posing; of animals