spirt psirt siprt isprt pisrt ipsrt sprit psrit srpit rspit prsit rpsit sirpt isrpt sript rsipt irspt rispt pirst iprst prist rpist irpst ripst spitr psitr siptr isptr pistr ipstr sptir pstir stpir tspir ptsir tpsir sitpr istpr stipr tsipr itspr tispr pitsr iptsr ptisr tpisr itpsr tipsr sprti psrti srpti rspti prsti rpsti sptri pstri stpri tspri ptsri tpsri srtpi rstpi strpi tsrpi rtspi trspi prtsi rptsi ptrsi tprsi rtpsi trpsi sirtp isrtp sritp rsitp irstp ristp sitrp istrp stirp tsirp itsrp tisrp srtip rstip strip tsrip rtsip trsip irtsp ritsp itrsp tirsp rtisp trisp pirts iprts prits rpits irpts ripts pitrs iptrs ptirs tpirs itprs tiprs prtis rptis ptris tpris rtpis trpis irtps ritps itrps tirps rtips trips
Note: these 'words' (valid or invalid) are all the permutations of the word spirt. These words are obtained by scrambling the letters in spirt.