opulento -a, wealthy, opulent, splendid.
ora, now.
oración, f., prayer, sentence; Oración, Angelus (the evening prayer, which is said at the ringing of the church bell).
orbe, m., orb, sphere, world.
orden, m., order.
oreja, f., ear.
Orellana (prop. noun).
organista, m. and f., organist.
organizar, to organize.
órgano, m., organ.