pixie vs elf

pixie and elf both are nouns.

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

As nouns, pixie and elf are synonyms defined as:

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

pixie (noun)	elf (noun)
(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