O字開頭的單詞或詞組
onwardoctalorder codeoverloadomeletOedipus complexoneselfoutspokenoverdoobstructoverleafOkieoversleepOceaniaonomatopoeiaoff and onoverjoyedopportuneoff-siteOrizaba jalapovooverreactOOPobbligatooffice workerorchidoverestimateoverrunowe sth to sborchardoil filteroutliveoff guardon the horizonon the trackoff-whiteoilson callobservingofficiallyOrpheusoligo-