brownie vs cookie

brownie and cookie both are nouns.

Word	Noun	Adjective	Verb	Adverb
brownie	Yes	No	No	No
cookie	Yes	No	No	No

As nouns, cookie is a hypernym of brownie; that is, cookie is a word with a broader meaning than brownie:

Other hypernyms of brownie include biscuit, cooky.

brownie (noun)	cookie (noun)
square or bar of very rich chocolate cake usually with nuts	a short line of text that a web site puts on your computer's hard drive when you access the web site
(folklore) fairies that are somewhat mischievous	any of various small flat sweet cakes
	the cook on a ranch or at a camp