wreathe vs ornament

wreathe is not a noun while ornament is a noun.

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

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

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

wreathe (noun)	ornament (noun)
	something used to beautify

wreathe (verb)	ornament (verb)
form into a wreath	make more attractive by adding ornament, colour, etc.
decorate or deck with wreaths	be an ornament to
move with slow, sinuous movements