cuisine vs gastronomy

cuisine and gastronomy both are nouns.

Word	Noun	Adjective	Verb	Adverb
cuisine	Yes	No	No	No
gastronomy	Yes	No	No	No

As nouns, gastronomy is a hyponym of cuisine; that is, gastronomy is a word with a more specific, narrower meaning than cuisine:

Other hyponyms of cuisine include dim sum, haute cuisine, nouvelle cuisine, rechauffe.

cuisine (noun)	gastronomy (noun)
the practice or manner of preparing food or the food so prepared	the art and practice of choosing and preparing and eating good food
	a particular style of cookery (as of a region)