gremlin vs brownie

gremlin and brownie both are nouns.

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

As nouns, gremlin and brownie are synonyms defined as:

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

gremlin (noun)	brownie (noun)
(folklore) fairies that are somewhat mischievous	square or bar of very rich chocolate cake usually with nuts
	(folklore) fairies that are somewhat mischievous