cavil acvil cvail vcail avcil vacil caivl acivl ciavl icavl aicvl iacvl cvial vcial cival icval vical ivcal avicl vaicl aivcl iavcl viacl ivacl cavli acvli cvali vcali avcli vacli calvi aclvi clavi lcavi alcvi lacvi cvlai vclai clvai lcvai vlcai lvcai avlci valci alvci lavci vlaci lvaci cailv acilv cialv icalv aiclv iaclv caliv acliv claiv lcaiv alciv laciv cilav iclav cliav lciav ilcav licav ailcv ialcv alicv laicv ilacv liacv cvila vcila civla icvla vicla ivcla cvlia vclia clvia lcvia vlcia lvcia cilva iclva cliva lciva ilcva licva vilca ivlca vlica lvica ilvca livca avilc vailc aivlc iavlc vialc ivalc avlic valic alvic lavic vlaic lvaic ailvc ialvc alivc laivc ilavc liavc vilac ivlac vliac lviac ilvac livac
Note: these 'words' (valid or invalid) are all the permutations of the word cavil. These words are obtained by scrambling the letters in cavil.