rotunda vs room

rotunda and room both are nouns.

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

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

rotunda (noun)	room (noun)
a large circular room	an area within a building enclosed by walls and floor and ceiling
a building having a circular plan and a dome	the people who are present in a room
	space for movement
	opportunity for

rotunda (verb)	room (verb)
	live and take one's meals at or in