gastronomical vs gastronomy

gastronomical is not a noun while gastronomy is a noun.

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

gastronomical (noun)	gastronomy (noun)
	the art and practice of choosing and preparing and eating good food
	a particular style of cookery (as of a region)

gastronomical (adjective)	gastronomy (adjective)
of or relating to gastronomy