festoon vs ornament

festoon and ornament both are nouns.

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

As verbs, ornament is a hypernym of festoon; that is, ornament is a word with a broader meaning than festoon:

Other hypernyms of festoon include adorn, beautify, decorate, embellish, grace.

festoon (noun)	ornament (noun)
flower chains suspended in curves between points as a decoration	something used to beautify
an embellishment consisting of a decorative representation of a string of flowers suspended between two points; used on pottery or in architectural work
a curtain of fabric draped and bound at intervals to form graceful curves

festoon (verb)	ornament (verb)
decorate with strings of flowers	make more attractive by adding ornament, colour, etc.
	be an ornament to