brownie vs gremlin

brownie and gremlin both are nouns.

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

As nouns, brownie and gremlin are synonyms defined as:

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

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