earth-closet vs outbuilding

earth-closet and outbuilding both are nouns.

Word	Noun	Adjective	Verb	Adverb
earth-closet	Yes	No	No	No
outbuilding	Yes	No	No	No

As nouns, outbuilding is a hypernym of earth-closet; that is, outbuilding is a word with a broader meaning than earth-closet:

earth-closet: a small outbuilding with a bench having holes through which a user can defecate
outbuilding: a building that is subordinate to and separate from a main building

earth-closet (noun)	outbuilding (noun)
a small outbuilding with a bench having holes through which a user can defecate	a building that is subordinate to and separate from a main building