nipper inpper npiper pniper ipnper pinper nipper inpper npiper pniper ipnper pinper nppier pnpier nppier pnpier ppnier ppnier ippner pipner ippner pipner ppiner ppiner nipepr inpepr npiepr pniepr ipnepr pinepr nieppr ineppr neippr enippr ienppr einppr npeipr pneipr nepipr enpipr penipr epnipr ipenpr pienpr iepnpr eipnpr peinpr epinpr nipepr inpepr npiepr pniepr ipnepr pinepr nieppr ineppr neippr enippr ienppr einppr npeipr pneipr nepipr enpipr penipr epnipr ipenpr pienpr iepnpr eipnpr peinpr epinpr nppeir pnpeir nppeir pnpeir ppneir ppneir npepir pnepir neppir enppir penpir epnpir npepir pnepir neppir enppir penpir epnpir ppenir ppenir pepnir eppnir pepnir eppnir ippenr pipenr ippenr pipenr ppienr ppienr ipepnr piepnr ieppnr eippnr peipnr epipnr ipepnr piepnr ieppnr eippnr peipnr epipnr ppeinr ppeinr pepinr eppinr pepinr eppinr nippre inppre npipre pnipre ipnpre pinpre nippre inppre npipre pnipre ipnpre pinpre nppire pnpire nppire pnpire ppnire ppnire ippnre pipnre ippnre pipnre ppinre ppinre niprpe inprpe npirpe pnirpe ipnrpe pinrpe nirppe inrppe nrippe rnippe irnppe rinppe npripe pnripe nrpipe rnpipe prnipe rpnipe iprnpe pirnpe irpnpe ripnpe prinpe rpinpe niprpe inprpe npirpe pnirpe ipnrpe pinrpe nirppe inrppe nrippe rnippe irnppe rinppe npripe pnripe nrpipe rnpipe prnipe rpnipe iprnpe pirnpe irpnpe ripnpe prinpe rpinpe npprie pnprie npprie pnprie ppnrie ppnrie nprpie pnrpie nrppie rnppie prnpie rpnpie nprpie pnrpie nrppie rnppie prnpie rpnpie pprnie pprnie prpnie rppnie prpnie rppnie ipprne piprne ipprne piprne ppirne ppirne iprpne pirpne irppne rippne pripne rpipne iprpne pirpne irppne rippne pripne rpipne pprine pprine prpine rppine prpine rppine niperp inperp npierp pnierp ipnerp pinerp nieprp ineprp neiprp eniprp ienprp einprp npeirp pneirp nepirp enpirp penirp epnirp ipenrp pienrp iepnrp eipnrp peinrp epinrp niprep inprep npirep pnirep ipnrep pinrep nirpep inrpep nripep rnipep irnpep rinpep npriep pnriep nrpiep rnpiep prniep rpniep iprnep pirnep irpnep ripnep prinep rpinep nierpp inerpp neirpp enirpp ienrpp einrpp nirepp inrepp nriepp rniepp irnepp rinepp neripp enripp nreipp rneipp ernipp renipp iernpp eirnpp irenpp rienpp erinpp reinpp nperip pnerip neprip enprip penrip epnrip npreip pnreip nrpeip rnpeip prneip rpneip nerpip enrpip nrepip rnepip ernpip renpip pernip eprnip prenip rpenip erpnip repnip ipernp piernp ieprnp eiprnp peirnp epirnp iprenp pirenp irpenp ripenp prienp rpienp ierpnp eirpnp irepnp riepnp eripnp reipnp perinp eprinp preinp rpeinp erpinp repinp niperp inperp npierp pnierp ipnerp pinerp nieprp ineprp neiprp eniprp ienprp einprp npeirp pneirp nepirp enpirp penirp epnirp ipenrp pienrp iepnrp eipnrp peinrp epinrp niprep inprep npirep pnirep ipnrep pinrep nirpep inrpep nripep rnipep irnpep rinpep npriep pnriep nrpiep rnpiep prniep rpniep iprnep pirnep irpnep ripnep prinep rpinep nierpp inerpp neirpp enirpp ienrpp einrpp nirepp inrepp nriepp rniepp irnepp rinepp neripp enripp nreipp rneipp ernipp renipp iernpp eirnpp irenpp rienpp erinpp reinpp nperip pnerip neprip enprip penrip epnrip npreip pnreip nrpeip rnpeip prneip rpneip nerpip enrpip nrepip rnepip ernpip renpip pernip eprnip prenip rpenip erpnip repnip ipernp piernp ieprnp eiprnp peirnp epirnp iprenp pirenp irpenp ripenp prienp rpienp ierpnp eirpnp irepnp riepnp eripnp reipnp perinp eprinp preinp rpeinp erpinp repinp npperi pnperi npperi pnperi ppneri ppneri npepri pnepri neppri enppri penpri epnpri npepri pnepri neppri enppri penpri epnpri ppenri ppenri pepnri eppnri pepnri eppnri npprei pnprei npprei pnprei ppnrei ppnrei nprpei pnrpei nrppei rnppei prnpei rpnpei nprpei pnrpei nrppei rnppei prnpei rpnpei pprnei pprnei prpnei rppnei prpnei rppnei nperpi pnerpi neprpi enprpi penrpi epnrpi nprepi pnrepi nrpepi rnpepi prnepi rpnepi nerppi enrppi nreppi rneppi ernppi renppi pernpi eprnpi prenpi rpenpi erpnpi repnpi nperpi pnerpi neprpi enprpi penrpi epnrpi nprepi pnrepi nrpepi rnpepi prnepi rpnepi nerppi enrppi nreppi rneppi ernppi renppi pernpi eprnpi prenpi rpenpi erpnpi repnpi pperni pperni peprni epprni peprni epprni ppreni ppreni prpeni rppeni prpeni rppeni perpni eprpni prepni rpepni erppni reppni perpni eprpni prepni rpepni erppni reppni ippern pipern ippern pipern ppiern ppiern ipeprn pieprn iepprn eipprn peiprn epiprn ipeprn pieprn iepprn eipprn peiprn epiprn ppeirn ppeirn pepirn eppirn pepirn eppirn ippren pipren ippren pipren ppiren ppiren iprpen pirpen irppen rippen pripen rpipen iprpen pirpen irppen rippen pripen rpipen pprien pprien prpien rppien prpien rppien iperpn pierpn ieprpn eiprpn peirpn epirpn iprepn pirepn irpepn ripepn priepn rpiepn ierppn eirppn ireppn rieppn erippn reippn peripn epripn preipn rpeipn erpipn repipn iperpn pierpn ieprpn eiprpn peirpn epirpn iprepn pirepn irpepn ripepn priepn rpiepn ierppn eirppn ireppn rieppn erippn reippn peripn epripn preipn rpeipn erpipn repipn pperin pperin peprin epprin peprin epprin pprein pprein prpein rppein prpein rppein perpin eprpin prepin rpepin erppin reppin perpin eprpin prepin rpepin erppin reppin
Note: these 'words' (valid or invalid) are all the permutations of the word nipper. These words are obtained by scrambling the letters in nipper.