Norwegian elkhound vs hound dog

Norwegian elkhound and hound dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
Norwegian elkhound	Yes	No	No	No
hound dog	Yes	No	No	No

As nouns, hound dog is a hypernym of Norwegian elkhound; that is, hound dog is a word with a broader meaning than Norwegian elkhound:

Norwegian elkhound: breed of compact medium-sized dog with a heavy grey coat developed in Norway for hunting elk
hound dog: any of several breeds of dog used for hunting typically having large drooping ears

Other hypernyms of Norwegian elkhound include hound.

Norwegian elkhound (noun)	hound dog (noun)
breed of compact medium-sized dog with a heavy grey coat developed in Norway for hunting elk	any of several breeds of dog used for hunting typically having large drooping ears