O字开头的单词或词组
opusOmanobligatoryoutbreakorthodoxover-the-counteroff-limitsohoocclusionoutrageoccultobliviousotorhinolaryngologyoctetoffspringorchestrateOphidiaOklahomaorphanageovertureon arrivalobjectivenessornamentOxfordoursoctalon airoutdoorsOedipus complexonceoverchargeobsidianorder codeOct.outcomeon dutyonwardoutspokenonyxovertoverheardopposed
