scenery vs backdrop

scenery and backdrop both are nouns.

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

As nouns, backdrop is a hyponym of scenery; that is, backdrop 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
backdrop: scenery hung at back of stage

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

scenery (noun)	backdrop (noun)
the painted structures of a stage set that are intended to suggest a particular locale	scenery hung at back of stage
the appearance of a place