pesky epsky pseky speky espky sepky peksy epksy pkesy kpesy ekpsy kepsy pskey spkey pksey kpsey skpey kspey eskpy sekpy ekspy kespy skepy ksepy pesyk epsyk pseyk speyk espyk sepyk peysk epysk pyesk ypesk eypsk yepsk psyek spyek pysek ypsek sypek yspek esypk seypk eyspk yespk syepk ysepk pekys epkys pkeys kpeys ekpys kepys peyks epyks pyeks ypeks eypks yepks pkyes kpyes pykes ypkes kypes ykpes ekyps keyps eykps yekps kyeps ykeps pskye spkye pksye kpsye skpye kspye psyke spyke pyske ypske sypke yspke pkyse kpyse pykse ypkse kypse ykpse skype ksype sykpe yskpe kyspe ykspe eskyp sekyp eksyp kesyp skeyp kseyp esykp seykp eyskp yeskp syekp ysekp ekysp keysp eyksp yeksp kyesp ykesp skyep ksyep sykep yskep kysep yksep
Note: these 'words' (valid or invalid) are all the permutations of the word pesky. These words are obtained by scrambling the letters in pesky.