cookery vs blacken

cookery is a noun but blacken is not a noun.

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

cookery (noun)	blacken (noun)
the act of preparing something (as food) by the application of heat

cookery (verb)	blacken (verb)
	make or become black
	burn slightly and superficially so as to affect color