garnish vs decorate

garnish is a noun but decorate is not a noun.

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

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

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

garnish (noun)	decorate (noun)
any decoration added as a trimming or adornment
something (such as parsley) added to a dish for flavor or decoration

garnish (verb)	decorate (verb)
decorate (food), as with parsley or other ornamental foods	provide with decoration
take a debtor's wages on legal orders, such as for child support	make more attractive by adding ornament, colour, etc.
	award a mark of honor, such as a medal, to
	be beautiful to look at