hound dog vs hunting dog

hound dog and hunting dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
hound dog	Yes	No	No	No
hunting dog	Yes	No	No	No

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

hound dog: any of several breeds of dog used for hunting typically having large drooping ears
hunting dog: a dog used in hunting game

hound dog (noun)	hunting dog (noun)
any of several breeds of dog used for hunting typically having large drooping ears	a dog used in hunting game