ripens irpens rpiens priens iprens pirens riepns irepns reipns eripns ierpns eirpns rpeins preins repins erpins perins eprins iperns pierns ieprns eiprns peirns epirns ripnes irpnes rpines prines iprnes pirnes rinpes irnpes rnipes nripes inrpes nirpes rpnies prnies rnpies nrpies pnries npries ipnres pinres inpres nipres pnires npires rienps irenps reinps erinps iernps eirnps rineps irneps rnieps nrieps inreps nireps renips ernips rneips nreips enrips nerips ienrps einrps inerps nierps enirps neirps rpenis prenis repnis erpnis pernis eprnis rpneis prneis rnpeis nrpeis pnreis npreis renpis ernpis rnepis nrepis enrpis nerpis penris epnris pneris nperis enpris nepris ipenrs pienrs iepnrs eipnrs peinrs epinrs ipners piners inpers nipers pniers npiers ienprs einprs ineprs nieprs eniprs neiprs penirs epnirs pneirs npeirs enpirs nepirs ripesn irpesn rpiesn priesn ipresn piresn riepsn irepsn reipsn eripsn ierpsn eirpsn rpeisn preisn repisn erpisn perisn eprisn ipersn piersn ieprsn eiprsn peirsn epirsn ripsen irpsen rpisen prisen iprsen pirsen rispen irspen rsipen sripen isrpen sirpen rpsien prsien rspien srpien psrien sprien ipsren pisren ispren sipren psiren spiren riespn irespn reispn erispn ierspn eirspn risepn irsepn rsiepn sriepn isrepn sirepn resipn ersipn rseipn sreipn esripn seripn iesrpn eisrpn iserpn sierpn esirpn seirpn rpesin presin repsin erpsin persin eprsin rpsein prsein rspein srpein psrein sprein respin erspin rsepin srepin esrpin serpin pesrin epsrin pserin sperin esprin seprin ipesrn piesrn iepsrn eipsrn peisrn episrn ipsern pisern ispern sipern psiern spiern iesprn eisprn iseprn sieprn esiprn seiprn pesirn epsirn pseirn speirn espirn sepirn ripnse irpnse rpinse prinse iprnse pirnse rinpse irnpse rnipse nripse inrpse nirpse rpnise prnise rnpise nrpise pnrise nprise ipnrse pinrse inprse niprse pnirse npirse ripsne irpsne rpisne prisne iprsne pirsne rispne irspne rsipne sripne isrpne sirpne rpsine prsine rspine srpine psrine sprine ipsrne pisrne isprne siprne psirne spirne rinspe irnspe rnispe nrispe inrspe nirspe risnpe irsnpe rsinpe srinpe isrnpe sirnpe rnsipe nrsipe rsnipe srnipe nsripe snripe insrpe nisrpe isnrpe sinrpe nsirpe snirpe rpnsie prnsie rnpsie nrpsie pnrsie nprsie rpsnie prsnie rspnie srpnie psrnie sprnie rnspie nrspie rsnpie srnpie nsrpie snrpie pnsrie npsrie psnrie spnrie nsprie snprie ipnsre pinsre inpsre nipsre pnisre npisre ipsnre pisnre ispnre sipnre psinre spinre inspre nispre isnpre sinpre nsipre snipre pnsire npsire psnire spnire nspire snpire riensp irensp reinsp erinsp iernsp eirnsp rinesp irnesp rniesp nriesp inresp niresp renisp ernisp rneisp nreisp enrisp nerisp ienrsp einrsp inersp niersp enirsp neirsp riesnp iresnp reisnp erisnp iersnp eirsnp risenp irsenp rsienp srienp isrenp sirenp resinp ersinp rseinp sreinp esrinp serinp iesrnp eisrnp isernp siernp esirnp seirnp rinsep irnsep rnisep nrisep inrsep nirsep risnep irsnep rsinep srinep isrnep sirnep rnsiep nrsiep rsniep srniep nsriep snriep insrep nisrep isnrep sinrep nsirep snirep rensip ernsip rnesip nresip enrsip nersip resnip ersnip rsenip srenip esrnip sernip rnseip nrseip rsneip srneip nsreip snreip ensrip nesrip esnrip senrip nserip snerip iensrp einsrp inesrp niesrp enisrp neisrp iesnrp eisnrp isenrp sienrp esinrp seinrp inserp niserp isnerp sinerp nsierp snierp ensirp nesirp esnirp senirp nseirp sneirp rpensi prensi repnsi erpnsi pernsi eprnsi rpnesi prnesi rnpesi nrpesi pnresi npresi renpsi ernpsi rnepsi nrepsi enrpsi nerpsi penrsi epnrsi pnersi npersi enprsi neprsi rpesni presni repsni erpsni persni eprsni rpseni prseni rspeni srpeni psreni spreni respni erspni rsepni srepni esrpni serpni pesrni epsrni pserni sperni esprni seprni rpnsei prnsei rnpsei nrpsei pnrsei nprsei rpsnei prsnei rspnei srpnei psrnei sprnei rnspei nrspei rsnpei srnpei nsrpei snrpei pnsrei npsrei psnrei spnrei nsprei snprei renspi ernspi rnespi nrespi enrspi nerspi resnpi ersnpi rsenpi srenpi esrnpi sernpi rnsepi nrsepi rsnepi srnepi nsrepi snrepi ensrpi nesrpi esnrpi senrpi nserpi snerpi pensri epnsri pnesri npesri enpsri nepsri pesnri epsnri psenri spenri espnri sepnri pnseri npseri psneri spneri nsperi snperi enspri nespri esnpri senpri nsepri snepri ipensr piensr iepnsr eipnsr peinsr epinsr ipnesr pinesr inpesr nipesr pniesr npiesr ienpsr einpsr inepsr niepsr enipsr neipsr penisr epnisr pneisr npeisr enpisr nepisr ipesnr piesnr iepsnr eipsnr peisnr episnr ipsenr pisenr ispenr sipenr psienr spienr iespnr eispnr isepnr siepnr esipnr seipnr pesinr epsinr pseinr speinr espinr sepinr ipnser pinser inpser nipser pniser npiser ipsner pisner ispner sipner psiner spiner insper nisper isnper sinper nsiper sniper pnsier npsier psnier spnier nspier snpier ienspr einspr inespr niespr enispr neispr iesnpr eisnpr isenpr sienpr esinpr seinpr insepr nisepr isnepr sinepr nsiepr sniepr ensipr nesipr esnipr senipr nseipr sneipr pensir epnsir pnesir npesir enpsir nepsir pesnir epsnir psenir spenir espnir sepnir pnseir npseir psneir spneir nspeir snpeir enspir nespir esnpir senpir nsepir snepir
Note: these 'words' (valid or invalid) are all the permutations of the word ripens. These words are obtained by scrambling the letters in ripens.