set decoration vs ornament

set decoration and ornament both are nouns.

Word	Noun	Adjective	Verb	Adverb
set decoration	Yes	No	No	No
ornament	Yes	No	Yes	No

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

set decoration: a decoration used as part of the set of a theatrical or movie production
ornament: something used to beautify

Other hypernyms of set decoration include decoration, ornamentation.

set decoration (noun)	ornament (noun)
a decoration used as part of the set of a theatrical or movie production	something used to beautify

set decoration (verb)	ornament (verb)
	make more attractive by adding ornament, colour, etc.
	be an ornament to