dog house vs outbuilding

dog house and outbuilding both are nouns.

Word	Noun	Adjective	Verb	Adverb
dog house	Yes	No	No	No
outbuilding	Yes	No	No	No

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

dog house: outbuilding that serves as a shelter for a dog
outbuilding: a building that is subordinate to and separate from a main building

Other hypernyms of dog house include shelter.

dog house (noun)	outbuilding (noun)
outbuilding that serves as a shelter for a dog	a building that is subordinate to and separate from a main building