brownie vs pixie

brownie and pixie both are nouns.

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

As nouns, brownie and pixie are synonyms defined as:

Other synonyms of brownie include elf, gremlin, hob, imp, pixy.

brownie (noun)	pixie (noun)
square or bar of very rich chocolate cake usually with nuts	(folklore) fairies that are somewhat mischievous
(folklore) fairies that are somewhat mischievous	creeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowers; of the pine barrens of New Jersey and the Carolinas