shark hsark sahrk ashrk hasrk ahsrk shrak hsrak srhak rshak hrsak rhsak sarhk asrhk srahk rsahk arshk rashk harsk ahrsk hrask rhask arhsk rahsk shakr hsakr sahkr ashkr haskr ahskr shkar hskar skhar kshar hksar khsar sakhr askhr skahr ksahr akshr kashr haksr ahksr hkasr khasr akhsr kahsr shrka hsrka srhka rshka hrska rhska shkra hskra skhra kshra hksra khsra srkha rskha skrha ksrha rksha krsha hrksa rhksa hkrsa khrsa rkhsa krhsa sarkh asrkh srakh rsakh arskh raskh sakrh askrh skarh ksarh aksrh kasrh srkah rskah skrah ksrah rksah krsah arksh raksh akrsh karsh rkash krash harks ahrks hraks rhaks arhks rahks hakrs ahkrs hkars khars akhrs kahrs hrkas rhkas hkras khras rkhas krhas arkhs rakhs akrhs karhs rkahs krahs
Note: these 'words' (valid or invalid) are all the permutations of the word shark. These words are obtained by scrambling the letters in shark.