screening vs viewing

screening and viewing both are nouns.

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

As nouns, screening and viewing are synonyms defined as:

Other synonyms of screening include showing.

screening (noun)	viewing (noun)
the act of concealing the existence of something by obstructing the view of it	a vigil held over a corpse the night before burial
testing objects or persons in order to identify those with particular characteristics	the display of a motion picture
fabric of metal or plastic mesh
the display of a motion picture