ornament vs decoration

ornament and decoration both are nouns.

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

As nouns, ornament and decoration are synonyms defined as:

Other synonyms of ornament include ornamentation.

ornament (noun)	decoration (noun)
something used to beautify	the act of decorating something (in the hope of making it more attractive)
	something used to beautify
	an award for winning a championship or commemorating some other event

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