novelty vs adornment

novelty and adornment both are nouns.

Word	Noun	Adjective	Verb	Adverb
novelty	Yes	No	No	No
adornment	Yes	No	No	No

As nouns, adornment is a hypernym of novelty; that is, adornment is a word with a broader meaning than novelty:

novelty: cheap showy jewelry or ornament on clothing
adornment: a decoration of color or interest that is added to relieve plainness

novelty (noun)	adornment (noun)
cheap showy jewelry or ornament on clothing	the action of decorating yourself with something colorful and interesting
a small inexpensive mass-produced article	a decoration of color or interest that is added to relieve plainness
originality by virtue of being refreshingly novel
originality by virtue of being new and surprising