scenery vs masking

scenery and masking both are nouns.

Word	Noun	Adjective	Verb	Adverb
scenery	Yes	No	No	No
masking	Yes	No	No	No

As nouns, masking is a hyponym of scenery; that is, masking is a word with a more specific, narrower meaning than scenery:

scenery: the painted structures of a stage set that are intended to suggest a particular locale
masking: scenery used to block the audience's view of parts of the stage that should not be seen

Other hyponyms of scenery include backcloth, backdrop, background, flat, masking piece, set piece.

scenery (noun)	masking (noun)
the painted structures of a stage set that are intended to suggest a particular locale	the act of concealing the existence of something by obstructing the view of it
the appearance of a place	scenery used to block the audience's view of parts of the stage that should not be seen
	the blocking of one sensation resulting from the presence of another sensation