decoration vs ornament

decoration and ornament both are nouns.

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

As nouns, decoration and ornament are synonyms defined as:

Other synonyms of decoration include ornamentation.

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

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