pixie vs faerie

pixie and faerie both are nouns.

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

As nouns, faerie is a hypernym of pixie; that is, faerie is a word with a broader meaning than pixie:

Other hypernyms of pixie include faery, fairy, fay, sprite.

pixie (noun)	faerie (noun)
(folklore) fairies that are somewhat mischievous	the enchanted realm of fairies
creeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowers; of the pine barrens of New Jersey and the Carolinas	a small being, human in form, playful and having magical powers