O字開頭的單詞或詞組
obverseorderedor soopticalobedientOvidout of sightoptimaloftortOEDout of workout of placeon the lineoutdooroxenoffshoreoppressopen-endedon the weekendounceobliqueoinkon Mondayopacityoffensiveon one's own termsoutplayopen one's mind toourselvesoperatoroccurrenceoverdriveoozeout of the wayoffenseorganisationoxytocinorganizerobservantofficeopening