spell psell sepll espll pesll epsll splel pslel slpel lspel plsel lpsel selpl eslpl slepl lsepl elspl lespl pelsl eplsl plesl lpesl elpsl lepsl spell psell sepll espll pesll epsll splel pslel slpel lspel plsel lpsel selpl eslpl slepl lsepl elspl lespl pelsl eplsl plesl lpesl elpsl lepsl splle pslle slple lsple plsle lpsle splle pslle slple lsple plsle lpsle sllpe lslpe sllpe lslpe llspe llspe pllse lplse pllse lplse llpse llpse sellp esllp slelp lselp elslp leslp sellp esllp slelp lselp elslp leslp sllep lslep sllep lslep llsep llsep ellsp lelsp ellsp lelsp llesp llesp pells eplls plels lpels elpls lepls pells eplls plels lpels elpls lepls plles lples plles lples llpes llpes ellps lelps ellps lelps lleps lleps
Note: these 'words' (valid or invalid) are all the permutations of the word spell. These words are obtained by scrambling the letters in spell.