kelpie vs sheepdog

kelpie and sheepdog both are nouns.

Word	Noun	Adjective	Verb	Adverb
kelpie	Yes	No	No	No
sheepdog	Yes	No	No	No

As nouns, sheepdog is a hypernym of kelpie; that is, sheepdog is a word with a broader meaning than kelpie:

kelpie: an Australian sheepdog with pointed ears
sheepdog: any of various usually long-haired breeds of dog reared to herd and guard sheep

Other hypernyms of kelpie include sheep dog, shepherd dog.

kelpie (noun)	sheepdog (noun)
an Australian sheepdog with pointed ears	any of various usually long-haired breeds of dog reared to herd and guard sheep
(Scottish folklore) water spirit in the form of a horse that likes to drown its riders