jewel vs decorate

jewel is a noun but decorate is not a noun.

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

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

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

jewel (noun)	decorate (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)	decorate (verb)
adorn or decorate with precious stones	provide with decoration
	make more attractive by adding ornament, colour, etc.
	award a mark of honor, such as a medal, to
	be beautiful to look at