lisper ilsper lsiper sliper islper silper lipser ilpser lpiser pliser iplser pilser lspier slpier lpsier plsier splier pslier ispler sipler ipsler pisler spiler psiler lisepr ilsepr lsiepr sliepr islepr silepr liespr ilespr leispr elispr ielspr eilspr lseipr sleipr lesipr elsipr selipr eslipr iselpr sielpr ieslpr eislpr seilpr esilpr lipesr ilpesr lpiesr pliesr iplesr pilesr liepsr ilepsr leipsr elipsr ielpsr eilpsr lpeisr pleisr lepisr elpisr pelisr eplisr ipelsr pielsr ieplsr eiplsr peilsr epilsr lspeir slpeir lpseir plseir spleir psleir lsepir slepir lespir elspir selpir eslpir lpesir plesir lepsir elpsir pelsir eplsir spelir pselir seplir esplir peslir epslir ispelr sipelr ipselr piselr spielr psielr iseplr sieplr iesplr eisplr seiplr esiplr ipeslr pieslr iepslr eipslr peislr epislr speilr pseilr sepilr espilr pesilr epsilr lispre ilspre lsipre slipre islpre silpre lipsre ilpsre lpisre plisre iplsre pilsre lspire slpire lpsire plsire splire pslire isplre siplre ipslre pislre spilre psilre lisrpe ilsrpe lsirpe slirpe islrpe silrpe lirspe ilrspe lrispe rlispe irlspe rilspe lsripe slripe lrsipe rlsipe srlipe rslipe isrlpe sirlpe irslpe rislpe srilpe rsilpe liprse ilprse lpirse plirse iplrse pilrse lirpse ilrpse lripse rlipse irlpse rilpse lprise plrise lrpise rlpise prlise rplise iprlse pirlse irplse riplse prilse rpilse lsprie slprie lpsrie plsrie splrie pslrie lsrpie slrpie lrspie rlspie srlpie rslpie lprsie plrsie lrpsie rlpsie prlsie rplsie sprlie psrlie srplie rsplie prslie rpslie isprle siprle ipsrle pisrle spirle psirle isrple sirple irsple risple sriple rsiple iprsle pirsle irpsle ripsle prisle rpisle sprile psrile srpile rspile prsile rpsile liserp ilserp lsierp slierp islerp silerp liesrp ilesrp leisrp elisrp ielsrp eilsrp lseirp sleirp lesirp elsirp selirp eslirp iselrp sielrp ieslrp eislrp seilrp esilrp lisrep ilsrep lsirep slirep islrep silrep lirsep ilrsep lrisep rlisep irlsep rilsep lsriep slriep lrsiep rlsiep srliep rsliep isrlep sirlep irslep rislep srilep rsilep liersp ilersp leirsp elirsp ielrsp eilrsp liresp ilresp lriesp rliesp irlesp rilesp lerisp elrisp lreisp rleisp erlisp relisp ierlsp eirlsp irelsp rielsp erilsp reilsp lserip slerip lesrip elsrip selrip eslrip lsreip slreip lrseip rlseip srleip rsleip lersip elrsip lresip rlesip erlsip relsip serlip esrlip srelip rselip erslip reslip iserlp sierlp iesrlp eisrlp seirlp esirlp isrelp sirelp irselp riselp srielp rsielp ierslp eirslp ireslp rieslp erislp reislp serilp esrilp sreilp rseilp ersilp resilp lipers ilpers lpiers pliers iplers pilers lieprs ileprs leiprs eliprs ielprs eilprs lpeirs pleirs lepirs elpirs pelirs eplirs ipelrs pielrs ieplrs eiplrs peilrs epilrs lipres ilpres lpires plires iplres pilres lirpes ilrpes lripes rlipes irlpes rilpes lpries plries lrpies rlpies prlies rplies iprles pirles irples riples priles rpiles lierps ilerps leirps elirps ielrps eilrps lireps ilreps lrieps rlieps irleps rileps lerips elrips lreips rleips erlips relips ierlps eirlps irelps rielps erilps reilps lperis pleris lepris elpris pelris eplris lpreis plreis lrpeis rlpeis prleis rpleis lerpis elrpis lrepis rlepis erlpis relpis perlis eprlis prelis rpelis erplis replis iperls pierls ieprls eiprls peirls epirls iprels pirels irpels ripels priels rpiels ierpls eirpls irepls riepls eripls reipls perils eprils preils rpeils erpils repils lsperi slperi lpseri plseri spleri psleri lsepri slepri lespri elspri selpri eslpri lpesri plesri lepsri elpsri pelsri eplsri spelri pselri seplri esplri peslri epslri lsprei slprei lpsrei plsrei splrei pslrei lsrpei slrpei lrspei rlspei srlpei rslpei lprsei plrsei lrpsei rlpsei prlsei rplsei sprlei psrlei srplei rsplei prslei rpslei lserpi slerpi lesrpi elsrpi selrpi eslrpi lsrepi slrepi lrsepi rlsepi srlepi rslepi lerspi elrspi lrespi rlespi erlspi relspi serlpi esrlpi srelpi rselpi erslpi reslpi lpersi plersi leprsi elprsi pelrsi eplrsi lpresi plresi lrpesi rlpesi prlesi rplesi lerpsi elrpsi lrepsi rlepsi erlpsi relpsi perlsi eprlsi prelsi rpelsi erplsi replsi sperli pserli seprli esprli pesrli epsrli spreli psreli srpeli rspeli prseli rpseli serpli esrpli srepli rsepli erspli respli persli eprsli presli rpesli erpsli repsli isperl siperl ipserl piserl spierl psierl iseprl sieprl iesprl eisprl seiprl esiprl ipesrl piesrl iepsrl eipsrl peisrl episrl speirl pseirl sepirl espirl pesirl epsirl isprel siprel ipsrel pisrel spirel psirel isrpel sirpel irspel rispel sripel rsipel iprsel pirsel irpsel ripsel prisel rpisel spriel psriel srpiel rspiel prsiel rpsiel iserpl sierpl iesrpl eisrpl seirpl esirpl isrepl sirepl irsepl risepl sriepl rsiepl ierspl eirspl irespl riespl erispl reispl seripl esripl sreipl rseipl ersipl resipl ipersl piersl ieprsl eiprsl peirsl epirsl ipresl piresl irpesl ripesl priesl rpiesl ierpsl eirpsl irepsl riepsl eripsl reipsl perisl eprisl preisl rpeisl erpisl repisl speril pseril sepril espril pesril epsril spreil psreil srpeil rspeil prseil rpseil serpil esrpil srepil rsepil erspil respil persil eprsil presil rpesil erpsil repsil
Note: these 'words' (valid or invalid) are all the permutations of the word lisper. These words are obtained by scrambling the letters in lisper.