ornament vs embellish

ornament is a noun but embellish is not a noun.

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

As verbs, ornament and embellish are synonyms defined as:

ornament and embellish: make more attractive by adding ornament, colour, etc.

Other synonyms of ornament include adorn, beautify, decorate, grace.

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

Other hypernyms of ornament include adorn, beautify, deck, decorate, grace.

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

ornament (verb)	embellish (verb)
make more attractive by adding ornament, colour, etc.	make more beautiful
be an ornament to	add details to
	make more attractive by adding ornament, colour, etc.
	be beautiful to look at