festoon vs adorn

festoon is a noun but adorn is not a noun.

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

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

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

festoon (noun)	adorn (noun)
flower chains suspended in curves between points as a decoration
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)	adorn (verb)
decorate with strings of flowers	make more attractive by adding ornament, colour, etc.
	furnish with power or authority; of kings or emperors
	be beautiful to look at