oratorio, m., oratory, chapel.
orden, f., order.
ordenanza, m., orderly, clerk.
ordenar, to arrange, assort, command, direct.
ordinario, m., ordinary; de —, adv., frequently, many times.
oreja, f., ear.
organismo, m., organism.
orgullo, m., pride.
oro, m., gold.
os, pl., you, to you.