outbuilding vs edifice

outbuilding and edifice both are nouns.

Word	Noun	Adjective	Verb	Adverb
outbuilding	Yes	No	No	No
edifice	Yes	No	No	No

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

outbuilding: a building that is subordinate to and separate from a main building
edifice: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of outbuilding include building.

outbuilding (noun)	edifice (noun)
a building that is subordinate to and separate from a main building	a structure that has a roof and walls and stands more or less permanently in one place