effere effete effoff effore effort efreet efter- ekero eototo eroto- errett etoeot ettore feeror feetof fekete feofor ferfer feroke ferrer ferret ferro- fertee fertek ferter fetter foerre foeto- foetor fokker foofoo fooker footer forker forket forrer forrot fortee forter freeof freeto frefre frette froofe fterer fterre k-tree keefer keeffe keeker keokee kereft kerker kertee kertok ketter koffee kokoro kokott kookoo kootoo koreke korere korero korkor kororo korrek kotoko kotter kottke krefft kreker kretek krokek kroket krotte ktetor oerter oferre offeet oftfor okeefe okerer oofotr ookroo oooooo ottoor r-tree reefer reeffe reeker reekof refeet refeff refert refete refoot refret refter reroof reroot reteer reteet reteoo retere retook retore retort retree retret retro- retrot retter rokete rokker rokket rokkor roofer rooker rooter rootof rootte rorek rorter rotork rotter t-tree teeoff teetee teeter teketo terete terreo terrer terret terror terrot terter tertre tetete tetter to-eke to-fro toetoe toffee tofore toofer tookto tooter tootoo torero torfer torker tororo torret tortor totoro totrot totter treeof treete trefet trefor trefot trefte treker tretee trette troffe troker trotro trotte