naifer anifer niafer inafer ainfer ianfer nafier anfier nfaier fnaier afnier fanier nifaer infaer nfiaer fniaer ifnaer finaer aifner iafner afiner fainer ifaner fianer naiefr aniefr niaefr inaefr ainefr ianefr naeifr aneifr neaifr enaifr aenifr eanifr nieafr ineafr neiafr eniafr ienafr einafr aienfr iaenfr aeinfr eainfr ieanfr eianfr nafeir anfeir nfaeir fnaeir afneir faneir naefir anefir neafir enafir aenfir eanfir nfeair fneair nefair enfair fenair efnair afenir faenir aefnir eafnir feanir efanir nifear infear nfiear fniear ifnear finear niefar inefar neifar enifar ienfar einfar nfeiar fneiar nefiar enfiar feniar efniar ifenar fienar iefnar eifnar feinar efinar aifenr iafenr afienr faienr ifaenr fiaenr aiefnr iaefnr aeifnr eaifnr ieafnr eiafnr afeinr faeinr aefinr eafinr feainr efainr ifeanr fieanr iefanr eifanr feianr efianr naifre anifre niafre inafre ainfre ianfre nafire anfire nfaire fnaire afnire fanire nifare infare nfiare fniare ifnare finare aifnre iafnre afinre fainre ifanre fianre nairfe anirfe niarfe inarfe ainrfe ianrfe narife anrife nraife rnaife arnife ranife nirafe inrafe nriafe rniafe irnafe rinafe airnfe iarnfe arinfe rainfe iranfe rianfe nafrie anfrie nfarie fnarie afnrie fanrie narfie anrfie nrafie rnafie arnfie ranfie nfraie fnraie nrfaie rnfaie frnaie rfnaie afrnie farnie arfnie rafnie franie rfanie nifrae infrae nfirae fnirae ifnrae finrae nirfae inrfae nrifae rnifae irnfae rinfae nfriae fnriae nrfiae rnfiae frniae rfniae ifrnae firnae irfnae rifnae frinae rfinae aifrne iafrne afirne fairne ifarne fiarne airfne iarfne arifne raifne irafne riafne afrine farine arfine rafine fraine rfaine ifrane firane irfane rifane friane rfiane naierf anierf niaerf inaerf ainerf ianerf naeirf aneirf neairf enairf aenirf eanirf niearf inearf neiarf eniarf ienarf einarf aienrf iaenrf aeinrf eainrf ieanrf eianrf nairef aniref niaref inaref ainref ianref narief anrief nraief rnaief arnief ranief niraef inraef nriaef rniaef irnaef rinaef airnef iarnef arinef rainef iranef rianef naerif anerif nearif enarif aenrif eanrif nareif anreif nraeif rnaeif arneif raneif neraif enraif nreaif rneaif ernaif renaif aernif earnif arenif raenif eranif reanif nieraf ineraf neiraf eniraf ienraf einraf nireaf inreaf nrieaf rnieaf irneaf rineaf neriaf enriaf nreiaf rneiaf erniaf reniaf iernaf eirnaf irenaf rienaf erinaf reinaf aiernf iaernf aeirnf eairnf iearnf eiarnf airenf iarenf arienf raienf iraenf riaenf aerinf earinf areinf raeinf erainf reainf ieranf eiranf ireanf rieanf erianf reianf naferi anferi nfaeri fnaeri afneri faneri naefri anefri neafri enafri aenfri eanfri nfeari fneari nefari enfari fenari efnari afenri faenri aefnri eafnri feanri efanri nafrei anfrei nfarei fnarei afnrei fanrei narfei anrfei nrafei rnafei arnfei ranfei nfraei fnraei nrfaei rnfaei frnaei rfnaei afrnei farnei arfnei rafnei franei rfanei naerfi anerfi nearfi enarfi aenrfi eanrfi narefi anrefi nraefi rnaefi arnefi ranefi nerafi enrafi nreafi rneafi ernafi renafi aernfi earnfi arenfi raenfi eranfi reanfi nferai fnerai nefrai enfrai fenrai efnrai nfreai fnreai nrfeai rnfeai frneai rfneai nerfai enrfai nrefai rnefai ernfai renfai fernai efrnai frenai rfenai erfnai refnai aferni faerni aefrni eafrni fearni efarni afreni fareni arfeni rafeni fraeni rfaeni aerfni earfni arefni raefni erafni reafni ferani efrani freani rfeani erfani refani nifera infera nfiera fniera ifnera finera niefra inefra neifra enifra ienfra einfra nfeira fneira nefira enfira fenira efnira ifenra fienra iefnra eifnra feinra efinra nifrea infrea nfirea fnirea ifnrea finrea nirfea inrfea nrifea rnifea irnfea rinfea nfriea fnriea nrfiea rnfiea frniea rfniea ifrnea firnea irfnea rifnea frinea rfinea nierfa inerfa neirfa enirfa ienrfa einrfa nirefa inrefa nriefa rniefa irnefa rinefa nerifa enrifa nreifa rneifa ernifa renifa iernfa eirnfa irenfa rienfa erinfa reinfa nferia fneria nefria enfria fenria efnria nfreia fnreia nrfeia rnfeia frneia rfneia nerfia enrfia nrefia rnefia ernfia renfia fernia efrnia frenia rfenia erfnia refnia iferna fierna iefrna eifrna feirna efirna ifrena firena irfena rifena friena rfiena ierfna eirfna irefna riefna erifna reifna ferina efrina freina rfeina erfina refina aifern iafern afiern faiern ifaern fiaern aiefrn iaefrn aeifrn eaifrn ieafrn eiafrn afeirn faeirn aefirn eafirn feairn efairn ifearn fiearn iefarn eifarn feiarn efiarn aifren iafren afiren fairen ifaren fiaren airfen iarfen arifen raifen irafen riafen afrien farien arfien rafien fraien rfaien ifraen firaen irfaen rifaen friaen rfiaen aierfn iaerfn aeirfn eairfn iearfn eiarfn airefn iarefn ariefn raiefn iraefn riaefn aerifn earifn areifn raeifn eraifn reaifn ierafn eirafn ireafn rieafn eriafn reiafn aferin faerin aefrin eafrin fearin efarin afrein farein arfein rafein fraein rfaein aerfin earfin arefin raefin erafin reafin ferain efrain freain rfeain erfain refain iferan fieran iefran eifran feiran efiran ifrean firean irfean rifean friean rfiean ierfan eirfan irefan riefan erifan reifan ferian efrian freian rfeian erfian refian
Note: these 'words' (valid or invalid) are all the permutations of the word naifer. These words are obtained by scrambling the letters in naifer.