brownie vs fairy

brownie and fairy both are nouns.

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

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

Other hypernyms of brownie include faerie, faery, fay, sprite.

brownie (noun)	fairy (noun)
square or bar of very rich chocolate cake usually with nuts	a small being, human in form, playful and having magical powers
(folklore) fairies that are somewhat mischievous	offensive term for a homosexual man