jewel vs adorn

jewel is a noun but adorn is not a noun.

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

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

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

jewel (noun)	adorn (noun)
a precious or semiprecious stone incorporated into a piece of jewelry
a person who is as brilliant and precious as a piece of jewelry

jewel (verb)	adorn (verb)
adorn or decorate with precious stones	make more attractive by adding ornament, colour, etc.
	furnish with power or authority; of kings or emperors
	be beautiful to look at