waist awist wiast iwast aiwst iawst wasit awsit wsait swait aswit sawit wisat iwsat wsiat swiat iswat siwat aiswt iaswt asiwt saiwt isawt siawt waits awits wiats iwats aiwts iawts watis awtis wtais twais atwis tawis witas iwtas wtias twias itwas tiwas aitws iatws atiws taiws itaws tiaws wasti awsti wsati swati aswti sawti watsi awtsi wtasi twasi atwsi tawsi wstai swtai wtsai twsai stwai tswai astwi satwi atswi taswi stawi tsawi wista iwsta wsita swita iswta siwta witsa iwtsa wtisa twisa itwsa tiwsa wstia swtia wtsia twsia stwia tswia istwa sitwa itswa tiswa stiwa tsiwa aistw iastw asitw saitw isatw siatw aitsw iatsw atisw taisw itasw tiasw astiw satiw atsiw tasiw staiw tsaiw istaw sitaw itsaw tisaw stiaw tsiaw
Note: these 'words' (valid or invalid) are all the permutations of the word waist. These words are obtained by scrambling the letters in waist.