rotunda vs edifice

rotunda and edifice both are nouns.

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

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

rotunda: a building having a circular plan and a dome
edifice: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of rotunda include building.

rotunda (noun)	edifice (noun)
a large circular room	a structure that has a roof and walls and stands more or less permanently in one place
a building having a circular plan and a dome