pipers ippers ppiers ppiers ippers pipers pieprs ipeprs peiprs epiprs iepprs eipprs ppeirs ppeirs pepirs eppirs pepirs eppirs ipeprs pieprs iepprs eipprs peiprs epiprs pipres ippres ppires ppires ippres pipres pirpes iprpes pripes rpipes irppes rippes ppries ppries prpies rppies prpies rppies iprpes pirpes irppes rippes pripes rpipes pierps iperps peirps epirps ieprps eiprps pireps ipreps prieps rpieps irpeps ripeps perips eprips preips rpeips erpips repips ierpps eirpps irepps riepps eripps reipps pperis pperis pepris eppris pepris eppris ppreis ppreis prpeis rppeis prpeis rppeis perpis eprpis prepis rpepis erppis reppis perpis eprpis prepis rpepis erppis reppis iperps pierps ieprps eiprps peirps epirps ipreps pireps irpeps ripeps prieps rpieps ierpps eirpps irepps riepps eripps reipps perips eprips preips rpeips erpips repips pipesr ippesr ppiesr ppiesr ippesr pipesr piepsr ipepsr peipsr epipsr ieppsr eippsr ppeisr ppeisr pepisr eppisr pepisr eppisr ipepsr piepsr ieppsr eippsr peipsr epipsr pipser ippser ppiser ppiser ippser pipser pisper ipsper psiper spiper ispper sipper ppsier ppsier pspier sppier pspier sppier ipsper pisper ispper sipper psiper spiper piespr ipespr peispr epispr iepspr eipspr pisepr ipsepr psiepr spiepr ispepr sipepr pesipr epsipr pseipr speipr espipr sepipr iesppr eisppr iseppr sieppr esippr seippr ppesir ppesir pepsir eppsir pepsir eppsir ppseir ppseir pspeir sppeir pspeir sppeir pespir epspir psepir spepir esppir seppir pespir epspir psepir spepir esppir seppir ipespr piespr iepspr eipspr peispr epispr ipsepr pisepr ispepr sipepr psiepr spiepr iesppr eisppr iseppr sieppr esippr seippr pesipr epsipr pseipr speipr espipr sepipr piprse ipprse ppirse ppirse ipprse piprse pirpse iprpse pripse rpipse irppse rippse pprise pprise prpise rppise prpise rppise iprpse pirpse irppse rippse pripse rpipse pipsre ippsre ppisre ppisre ippsre pipsre pispre ipspre psipre spipre isppre sippre ppsire ppsire pspire sppire pspire sppire ipspre pispre isppre sippre psipre spipre pirspe iprspe prispe rpispe irpspe ripspe pisrpe ipsrpe psirpe spirpe isprpe siprpe prsipe rpsipe psripe spripe rspipe srpipe irsppe risppe isrppe sirppe rsippe srippe pprsie pprsie prpsie rppsie prpsie rppsie ppsrie ppsrie psprie spprie psprie spprie prspie rpspie psrpie sprpie rsppie srppie prspie rpspie psrpie sprpie rsppie srppie iprspe pirspe irpspe ripspe prispe rpispe ipsrpe pisrpe isprpe siprpe psirpe spirpe irsppe risppe isrppe sirppe rsippe srippe prsipe rpsipe psripe spripe rspipe srpipe piersp ipersp peirsp epirsp ieprsp eiprsp piresp ipresp priesp rpiesp irpesp ripesp perisp eprisp preisp rpeisp erpisp repisp ierpsp eirpsp irepsp riepsp eripsp reipsp piesrp ipesrp peisrp episrp iepsrp eipsrp piserp ipserp psierp spierp isperp siperp pesirp epsirp pseirp speirp espirp sepirp iesprp eisprp iseprp sieprp esiprp seiprp pirsep iprsep prisep rpisep irpsep ripsep pisrep ipsrep psirep spirep isprep siprep prsiep rpsiep psriep spriep rspiep srpiep irspep rispep isrpep sirpep rsipep sripep persip eprsip presip rpesip erpsip repsip pesrip epsrip pserip sperip esprip seprip prseip rpseip psreip spreip rspeip srpeip erspip respip esrpip serpip rsepip srepip ierspp eirspp irespp riespp erispp reispp iesrpp eisrpp iserpp sierpp esirpp seirpp irsepp risepp isrepp sirepp rsiepp sriepp ersipp resipp esripp seripp rseipp sreipp ppersi ppersi peprsi epprsi peprsi epprsi ppresi ppresi prpesi rppesi prpesi rppesi perpsi eprpsi prepsi rpepsi erppsi reppsi perpsi eprpsi prepsi rpepsi erppsi reppsi ppesri ppesri pepsri eppsri pepsri eppsri ppseri ppseri psperi spperi psperi spperi pespri epspri psepri spepri esppri seppri pespri epspri psepri spepri esppri seppri pprsei pprsei prpsei rppsei prpsei rppsei ppsrei ppsrei psprei spprei psprei spprei prspei rpspei psrpei sprpei rsppei srppei prspei rpspei psrpei sprpei rsppei srppei perspi eprspi prespi rpespi erpspi repspi pesrpi epsrpi pserpi sperpi esprpi seprpi prsepi rpsepi psrepi sprepi rspepi srpepi ersppi resppi esrppi serppi rseppi sreppi perspi eprspi prespi rpespi erpspi repspi pesrpi epsrpi pserpi sperpi esprpi seprpi prsepi rpsepi psrepi sprepi rspepi srpepi ersppi resppi esrppi serppi rseppi sreppi ipersp piersp ieprsp eiprsp peirsp epirsp ipresp piresp irpesp ripesp priesp rpiesp ierpsp eirpsp irepsp riepsp eripsp reipsp perisp eprisp preisp rpeisp erpisp repisp ipesrp piesrp iepsrp eipsrp peisrp episrp ipserp piserp isperp siperp psierp spierp iesprp eisprp iseprp sieprp esiprp seiprp pesirp epsirp pseirp speirp espirp sepirp iprsep pirsep irpsep ripsep prisep rpisep ipsrep pisrep isprep siprep psirep spirep irspep rispep isrpep sirpep rsipep sripep prsiep rpsiep psriep spriep rspiep srpiep ierspp eirspp irespp riespp erispp reispp iesrpp eisrpp iserpp sierpp esirpp seirpp irsepp risepp isrepp sirepp rsiepp sriepp ersipp resipp esripp seripp rseipp sreipp persip eprsip presip rpesip erpsip repsip pesrip epsrip pserip sperip esprip seprip prseip rpseip psreip spreip rspeip srpeip erspip respip esrpip serpip rsepip srepip
Note: these 'words' (valid or invalid) are all the permutations of the word pipers. These words are obtained by scrambling the letters in pipers.