greins rgeins gerins egrins regins ergins griens rgiens girens igrens rigens irgens geirns egirns gierns igerns eigrns iegrns reigns erigns riegns iregns eirgns iergns grenis rgenis gernis egrnis regnis ergnis grneis rgneis gnreis ngreis rngeis nrgeis genris egnris gneris ngeris engris negris rengis erngis rnegis nregis enrgis nergis grines rgines girnes igrnes rignes irgnes grnies rgnies gnries ngries rngies nrgies ginres ignres gnires ngires ingres nigres ringes irnges rniges nriges inrges nirges geinrs eginrs gienrs igenrs eignrs iegnrs genirs egnirs gneirs ngeirs engirs negirs giners igners gniers ngiers ingers nigers eingrs iengrs enigrs neigrs inegrs niegrs reings erings riengs irengs eirngs ierngs renigs ernigs rneigs nreigs enrigs nerigs rinegs irnegs rniegs nriegs inregs niregs einrgs ienrgs enirgs neirgs inergs niergs greisn rgeisn gerisn egrisn regisn ergisn griesn rgiesn giresn igresn rigesn irgesn geirsn egirsn giersn igersn eigrsn iegrsn reigsn erigsn riegsn iregsn eirgsn iergsn gresin rgesin gersin egrsin regsin ergsin grsein rgsein gsrein sgrein rsgein srgein gesrin egsrin gserin sgerin esgrin segrin resgin ersgin rsegin sregin esrgin sergin grisen rgisen girsen igrsen rigsen irgsen grsien rgsien gsrien sgrien rsgien srgien gisren igsren gsiren sgiren isgren sigren risgen irsgen rsigen srigen isrgen sirgen geisrn egisrn giesrn igesrn eigsrn iegsrn gesirn egsirn gseirn sgeirn esgirn segirn gisern igsern gsiern sgiern isgern sigern eisgrn iesgrn esigrn seigrn isegrn siegrn reisgn erisgn riesgn iresgn eirsgn iersgn resign ersign rseign sreign esrign serign risegn irsegn rsiegn sriegn isregn siregn eisrgn iesrgn esirgn seirgn isergn siergn grensi rgensi gernsi egrnsi regnsi ergnsi grnesi rgnesi gnresi ngresi rngesi nrgesi genrsi egnrsi gnersi ngersi engrsi negrsi rengsi erngsi rnegsi nregsi enrgsi nergsi gresni rgesni gersni egrsni regsni ergsni grseni rgseni gsreni sgreni rsgeni srgeni gesrni egsrni gserni sgerni esgrni segrni resgni ersgni rsegni sregni esrgni sergni grnsei rgnsei gnrsei ngrsei rngsei nrgsei grsnei rgsnei gsrnei sgrnei rsgnei srgnei gnsrei ngsrei gsnrei sgnrei nsgrei sngrei rnsgei nrsgei rsngei srngei nsrgei snrgei gensri egnsri gnesri ngesri engsri negsri gesnri egsnri gsenri sgenri esgnri segnri gnseri ngseri gsneri sgneri nsgeri sngeri ensgri nesgri esngri sengri nsegri snegri rensgi ernsgi rnesgi nresgi enrsgi nersgi resngi ersngi rsengi srengi esrngi serngi rnsegi nrsegi rsnegi srnegi nsregi snregi ensrgi nesrgi esnrgi senrgi nsergi snergi grinse rginse girnse igrnse rignse irgnse grnise rgnise gnrise ngrise rngise nrgise ginrse ignrse gnirse ngirse ingrse nigrse ringse irngse rnigse nrigse inrgse nirgse grisne rgisne girsne igrsne rigsne irgsne grsine rgsine gsrine sgrine rsgine srgine gisrne igsrne gsirne sgirne isgrne sigrne risgne irsgne rsigne srigne isrgne sirgne grnsie rgnsie gnrsie ngrsie rngsie nrgsie grsnie rgsnie gsrnie sgrnie rsgnie srgnie gnsrie ngsrie gsnrie sgnrie nsgrie sngrie rnsgie nrsgie rsngie srngie nsrgie snrgie ginsre ignsre gnisre ngisre ingsre nigsre gisnre igsnre gsinre sginre isgnre signre gnsire ngsire gsnire sgnire nsgire sngire insgre nisgre isngre singre nsigre snigre rinsge irnsge rnisge nrisge inrsge nirsge risnge irsnge rsinge sringe isrnge sirnge rnsige nrsige rsnige srnige nsrige snrige insrge nisrge isnrge sinrge nsirge snirge geinsr eginsr giensr igensr eignsr iegnsr genisr egnisr gneisr ngeisr engisr negisr ginesr ignesr gniesr ngiesr ingesr nigesr eingsr iengsr enigsr neigsr inegsr niegsr geisnr egisnr giesnr igesnr eigsnr iegsnr gesinr egsinr gseinr sgeinr esginr seginr gisenr igsenr gsienr sgienr isgenr sigenr eisgnr iesgnr esignr seignr isegnr siegnr gensir egnsir gnesir ngesir engsir negsir gesnir egsnir gsenir sgenir esgnir segnir gnseir ngseir gsneir sgneir nsgeir sngeir ensgir nesgir esngir sengir nsegir snegir ginser ignser gniser ngiser ingser nigser gisner igsner gsiner sginer isgner signer gnsier ngsier gsnier sgnier nsgier sngier insger nisger isnger singer nsiger sniger einsgr iensgr enisgr neisgr inesgr niesgr eisngr iesngr esingr seingr isengr siengr ensigr nesigr esnigr senigr nseigr sneigr insegr nisegr isnegr sinegr nsiegr sniegr reinsg erinsg riensg irensg eirnsg iernsg renisg ernisg rneisg nreisg enrisg nerisg rinesg irnesg rniesg nriesg inresg niresg einrsg ienrsg enirsg neirsg inersg niersg reisng erisng riesng iresng eirsng iersng resing ersing rseing sreing esring sering riseng irseng rsieng srieng isreng sireng eisrng iesrng esirng seirng iserng sierng rensig ernsig rnesig nresig enrsig nersig resnig ersnig rsenig srenig esrnig sernig rnseig nrseig rsneig srneig nsreig snreig ensrig nesrig esnrig senrig nserig snerig rinseg irnseg rniseg nriseg inrseg nirseg risneg irsneg rsineg srineg isrneg sirneg rnsieg nrsieg rsnieg srnieg nsrieg snrieg insreg nisreg isnreg sinreg nsireg snireg einsrg iensrg enisrg neisrg inesrg niesrg eisnrg iesnrg esinrg seinrg isenrg sienrg ensirg nesirg esnirg senirg nseirg sneirg inserg niserg isnerg sinerg nsierg snierg
Note: these 'words' (valid or invalid) are all the permutations of the word greins. These words are obtained by scrambling the letters in greins.