#obligación# obligation, duties
#obra# work
#obrar# work; bring about
#obsequioso# obliging, courteous
#ocasión# chance, opportunity
#ocultar# hide, conceal
#oculto# hidden; secretly
#ocupar# occupy; #-se de# busy oneself with, give oneself up to; #ocupad la silla# sit down, be seated
#odiar# hate
#odio# hate, hatred