leprechaun vs imp

leprechaun and imp both are nouns.

Word	Noun	Adjective	Verb	Adverb
leprechaun	Yes	No	No	No
imp	Yes	No	No	No

As nouns, imp is a hypernym of leprechaun; that is, imp is a word with a broader meaning than leprechaun:

Other hypernyms of leprechaun include brownie, elf, gremlin, hob, pixie, pixy.

leprechaun (noun)	imp (noun)
a mischievous elf in Irish folklore	one who is playfully mischievous
	(folklore) fairies that are somewhat mischievous