frying vs cookery

frying and cookery both are nouns.

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

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

frying: cooking in fat or oil in a pan or griddle
cookery: the act of preparing something (as food) by the application of heat

Other hypernyms of frying include cooking, preparation.

frying (noun)	cookery (noun)
cooking in fat or oil in a pan or griddle	the act of preparing something (as food) by the application of heat