scenery vs set piece

scenery and set piece both are nouns.

Word	Noun	Adjective	Verb	Adverb
scenery	Yes	No	No	No
set piece	Yes	No	No	No

As nouns, set piece is a hyponym of scenery; that is, set piece 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
set piece: a piece of scenery intended to stand alone as part of the stage setting

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

scenery (noun)	set piece (noun)
the painted structures of a stage set that are intended to suggest a particular locale	a piece of scenery intended to stand alone as part of the stage setting
the appearance of a place