set piece vs scenery

set piece and scenery both are nouns.

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

As nouns, scenery is a hypernym of set piece; that is, scenery is a word with a broader meaning than set piece:

set piece: a piece of scenery intended to stand alone as part of the stage setting
scenery: the painted structures of a stage set that are intended to suggest a particular locale

Other hypernyms of set piece include scene.

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