poaching vs cookery

poaching and cookery both are nouns.

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

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

poaching: cooking in simmering liquid
cookery: the act of preparing something (as food) by the application of heat

Other hypernyms of poaching include cooking, preparation.

poaching (noun)	cookery (noun)
cooking in simmering liquid	the act of preparing something (as food) by the application of heat