roasting vs cookery

roasting and cookery both are nouns.

Word	Noun	Adjective	Verb	Adverb
roasting	Yes	No	No	No
cookery	Yes	No	No	No

As nouns, cookery is a hypernym of roasting; that is, cookery is a word with a broader meaning than roasting:

roasting: cooking (meat) by dry heat in an oven (usually with fat added)
cookery: the act of preparing something (as food) by the application of heat

Other hypernyms of roasting include cooking, preparation.

roasting (noun)	cookery (noun)
cooking (meat) by dry heat in an oven (usually with fat added)	the act of preparing something (as food) by the application of heat