Rotunda.
a.A round building; especially, one that is round both on the outside and inside, like the Pantheon at Rome. Less properly, but very commonly, used for a large round room; as, the rotunda of the Capitol at Washington.
n.building generic term, edifice generic term noun, room generic term
Vogais: oua
Consoantes: rtnd
rotund, rotundate, rotundo, retund, rotundity, redonda, redound, redounded, rationed, retained.