pester epster pseter speter espter septer petser eptser pteser tpeser etpser tepser psteer spteer ptseer tpseer stpeer tspeer estper setper etsper tesper steper tseper pesetr epsetr pseetr speetr espetr sepetr peestr epestr peestr epestr eepstr eepstr pseetr speetr pesetr epsetr sepetr espetr eseptr seeptr eesptr eesptr seeptr eseptr petesr eptesr pteesr tpeesr etpesr tepesr peetsr epetsr peetsr epetsr eeptsr eeptsr pteesr tpeesr petesr eptesr tepesr etpesr etepsr teepsr eetpsr eetpsr teepsr etepsr psteer spteer ptseer tpseer stpeer tspeer pseter speter pester epster septer espter pteser tpeser petser eptser tepser etpser steper tseper setper estper tesper etsper estepr setepr etsepr tesepr steepr tseepr esetpr seetpr eestpr eestpr seetpr esetpr etespr teespr eetspr eetspr teespr etespr steepr tseepr setepr estepr tesepr etsepr pestre epstre psetre spetre esptre septre petsre eptsre ptesre tpesre etpsre tepsre pstere sptere ptsere tpsere stpere tspere estpre setpre etspre tespre stepre tsepre pesrte epsrte pserte sperte esprte seprte perste eprste preste rpeste erpste repste psrete sprete prsete rpsete srpete rspete esrpte serpte erspte respte srepte rsepte petrse eptrse pterse tperse etprse teprse pertse eprtse pretse rpetse erptse reptse ptrese tprese prtese rptese trpese rtpese etrpse terpse ertpse retpse trepse rtepse pstree sptree ptsree tpsree stpree tspree psrtee sprtee prstee rpstee srptee rsptee ptrsee tprsee prtsee rptsee trpsee rtpsee strpee tsrpee srtpee rstpee trspee rtspee estrpe setrpe etsrpe tesrpe sterpe tserpe esrtpe sertpe erstpe restpe sretpe rsetpe etrspe terspe ertspe retspe trespe rtespe strepe tsrepe srtepe rstepe trsepe rtsepe pesert epsert pseert speert espert sepert peesrt epesrt peesrt epesrt eepsrt eepsrt pseert speert pesert epsert sepert espert eseprt seeprt eesprt eesprt seeprt eseprt pesret epsret pseret speret espret sepret perset eprset preset rpeset erpset repset psreet spreet prseet rpseet srpeet rspeet esrpet serpet erspet respet srepet rsepet peerst eperst peerst eperst eeprst eeprst perest eprest preest rpeest erpest repest perest eprest preest rpeest erpest repest eerpst eerpst erepst reepst erepst reepst pseret speret pesret epsret sepret espret psreet spreet prseet rpseet srpeet rspeet perset eprset preset rpeset erpset repset serpet esrpet srepet rsepet erspet respet eserpt seerpt eesrpt eesrpt seerpt eserpt esrept serept ersept resept sreept rseept eerspt eerspt erespt reespt erespt reespt serept esrept sreept rseept ersept resept peters epters pteers tpeers etpers tepers peetrs epetrs peetrs epetrs eeptrs eeptrs pteers tpeers peters epters tepers etpers eteprs teeprs eetprs eetprs teeprs eteprs petres eptres pteres tperes etpres tepres pertes eprtes pretes rpetes erptes reptes ptrees tprees prtees rptees trpees rtpees etrpes terpes ertpes retpes trepes rtepes peerts eperts peerts eperts eeprts eeprts perets eprets preets rpeets erpets repets perets eprets preets rpeets erpets repets eerpts eerpts erepts reepts erepts reepts pteres tperes petres eptres tepres etpres ptrees tprees prtees rptees trpees rtpees pertes eprtes pretes rpetes erptes reptes terpes etrpes trepes rtepes ertpes retpes eterps teerps eetrps eetrps teerps eterps etreps tereps erteps reteps treeps rteeps eertps eertps eretps reetps eretps reetps tereps etreps treeps rteeps erteps reteps pstere sptere ptsere tpsere stpere tspere psetre spetre pestre epstre septre esptre ptesre tpesre petsre eptsre tepsre etpsre stepre tsepre setpre estpre tespre etspre pstree sptree ptsree tpsree stpree tspree psrtee sprtee prstee rpstee srptee rsptee ptrsee tprsee prtsee rptsee trpsee rtpsee strpee tsrpee srtpee rstpee trspee rtspee pserte sperte pesrte epsrte seprte esprte psrete sprete prsete rpsete srpete rspete perste eprste preste rpeste erpste repste serpte esrpte srepte rsepte erspte respte pterse tperse petrse eptrse teprse etprse ptrese tprese prtese rptese trpese rtpese pertse eprtse pretse rpetse erptse reptse terpse etrpse trepse rtepse ertpse retpse sterpe tserpe setrpe estrpe tesrpe etsrpe strepe tsrepe srtepe rstepe trsepe rtsepe sertpe esrtpe sretpe rsetpe erstpe restpe terspe etrspe trespe rtespe ertspe retspe esterp seterp etserp teserp steerp tseerp esetrp seetrp eestrp eestrp seetrp esetrp etesrp teesrp eetsrp eetsrp teesrp etesrp steerp tseerp seterp esterp teserp etserp estrep setrep etsrep tesrep sterep tserep esrtep sertep erstep restep sretep rsetep etrsep tersep ertsep retsep tresep rtesep streep tsreep srteep rsteep trseep rtseep esertp seertp eesrtp eesrtp seertp esertp esretp seretp ersetp resetp sreetp rseetp eerstp eerstp erestp reestp erestp reestp seretp esretp sreetp rseetp ersetp resetp etersp teersp eetrsp eetrsp teersp etersp etresp teresp ertesp retesp treesp rteesp eertsp eertsp eretsp reetsp eretsp reetsp teresp etresp treesp rteesp ertesp retesp sterep tserep setrep estrep tesrep etsrep streep tsreep srteep rsteep trseep rtseep sertep esrtep sretep rsetep erstep restep tersep etrsep tresep rtesep ertsep retsep
Note: these 'words' (valid or invalid) are all the permutations of the word pester. These words are obtained by scrambling the letters in pester.