e-four effere effoff effore ekero errour eureko eururo feeror feofor ferfer feroke ferrer ferro- ferroq ferrur foerre fokker fokoue foofoo foofur fooker forker forrer forure foufou fouque fourer fourof fourou freeof frefre freure froofe fufore fukuro furfur furore furour furrer furrfu keefer keeffe keeker keokee keokuk kereru kerker kerkuk kerou keuruu koffee kofuku kokofu kokoku kokoro kokufu kookoo koreke korere korero korkor kororo korrek koruru kouere kouffo koukou kouoro kourou kqueue kreker krokek kukere kuo-fu kuroko kurree kururu oferre okeefe okerer okoure ookroo oooooo orrour ouerre q-free qorqor queere queerk querof queror querre queuer quooke quoque reefer reeffe reeker reekof refeff reroof reuere reuour rokker rokkor rokuko rokuro roofer rooker rorek rouffe rourke ruffer rurkee urouer uroure uruffe