illuminate vs ornament

illuminate is not a noun while ornament is a noun.

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

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

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

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

illuminate (verb)	ornament (verb)
introduce light into	make more attractive by adding ornament, colour, etc.
make free from confusion or ambiguity; make clear	be an ornament to
add embellishments and paintings to (medieval manuscripts)