gastronomy vs artistic creation

gastronomy and artistic creation both are nouns.

Word	Noun	Adjective	Verb	Adverb
gastronomy	Yes	No	No	No
artistic creation	Yes	No	No	No

As nouns, artistic creation is a hypernym of gastronomy; that is, artistic creation is a word with a broader meaning than gastronomy:

gastronomy: the art and practice of choosing and preparing and eating good food
artistic creation: the creation of beautiful or significant things

Other hypernyms of gastronomy include art, artistic production.

gastronomy (noun)	artistic creation (noun)
the art and practice of choosing and preparing and eating good food	the creation of beautiful or significant things
a particular style of cookery (as of a region)