observatory vs edifice

observatory and edifice both are nouns.

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

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

observatory: a building designed and equipped to observe astronomical phenomena
edifice: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of observatory include building.

observatory (noun)	edifice (noun)
a building designed and equipped to observe astronomical phenomena	a structure that has a roof and walls and stands more or less permanently in one place
a structure commanding a wide view of its surroundings