waster awster wsater swater aswter sawter watser awtser wtaser twaser atwser tawser wstaer swtaer wtsaer twsaer stwaer tswaer astwer satwer atswer taswer stawer tsawer wasetr awsetr wsaetr swaetr aswetr sawetr waestr awestr weastr ewastr aewstr eawstr wseatr sweatr wesatr ewsatr sewatr eswatr asewtr saewtr aeswtr easwtr seawtr esawtr watesr awtesr wtaesr twaesr atwesr tawesr waetsr awetsr weatsr ewatsr aewtsr eawtsr wteasr tweasr wetasr ewtasr tewasr etwasr atewsr taewsr aetwsr eatwsr teawsr etawsr wstear swtear wtsear twsear stwear tswear wsetar swetar westar ewstar sewtar eswtar wtesar twesar wetsar ewtsar tewsar etwsar stewar tsewar setwar estwar teswar etswar astewr satewr atsewr tasewr staewr tsaewr asetwr saetwr aestwr eastwr seatwr esatwr ateswr taeswr aetswr eatswr teaswr etaswr steawr tseawr setawr estawr tesawr etsawr wastre awstre wsatre swatre aswtre sawtre watsre awtsre wtasre twasre atwsre tawsre wstare swtare wtsare twsare stware tsware astwre satwre atswre taswre stawre tsawre wasrte awsrte wsarte swarte aswrte sawrte warste awrste wraste rwaste arwste rawste wsrate swrate wrsate rwsate srwate rswate asrwte sarwte arswte raswte srawte rsawte watrse awtrse wtarse twarse atwrse tawrse wartse awrtse wratse rwatse arwtse rawtse wtrase twrase wrtase rwtase trwase rtwase atrwse tarwse artwse ratwse trawse rtawse wstrae swtrae wtsrae twsrae stwrae tswrae wsrtae swrtae wrstae rwstae srwtae rswtae wtrsae twrsae wrtsae rwtsae trwsae rtwsae strwae tsrwae srtwae rstwae trswae rtswae astrwe satrwe atsrwe tasrwe starwe tsarwe asrtwe sartwe arstwe rastwe sratwe rsatwe atrswe tarswe artswe ratswe traswe rtaswe strawe tsrawe srtawe rstawe trsawe rtsawe wasert awsert wsaert swaert aswert sawert waesrt awesrt weasrt ewasrt aewsrt eawsrt wseart sweart wesart ewsart sewart eswart asewrt saewrt aeswrt easwrt seawrt esawrt wasret awsret wsaret swaret aswret sawret warset awrset wraset rwaset arwset rawset wsraet swraet wrsaet rwsaet srwaet rswaet asrwet sarwet arswet raswet srawet rsawet waerst awerst wearst ewarst aewrst eawrst warest awrest wraest rwaest arwest rawest werast ewrast wreast rweast erwast rewast aerwst earwst arewst raewst erawst reawst wserat swerat wesrat ewsrat sewrat eswrat wsreat swreat wrseat rwseat srweat rsweat wersat ewrsat wresat rwesat erwsat rewsat serwat esrwat srewat rsewat erswat reswat aserwt saerwt aesrwt easrwt searwt esarwt asrewt sarewt arsewt rasewt sraewt rsaewt aerswt earswt areswt raeswt eraswt reaswt serawt esrawt sreawt rseawt ersawt resawt waters awters wtaers twaers atwers tawers waetrs awetrs weatrs ewatrs aewtrs eawtrs wtears twears wetars ewtars tewars etwars atewrs taewrs aetwrs eatwrs teawrs etawrs watres awtres wtares twares atwres tawres wartes awrtes wrates rwates arwtes rawtes wtraes twraes wrtaes rwtaes trwaes rtwaes atrwes tarwes artwes ratwes trawes rtawes waerts awerts wearts ewarts aewrts eawrts warets awrets wraets rwaets arwets rawets werats ewrats wreats rweats erwats rewats aerwts earwts arewts raewts erawts reawts wteras tweras wetras ewtras tewras etwras wtreas twreas wrteas rwteas trweas rtweas wertas ewrtas wretas rwetas erwtas rewtas terwas etrwas trewas rtewas ertwas retwas aterws taerws aetrws eatrws tearws etarws atrews tarews artews ratews traews rtaews aertws eartws aretws raetws eratws reatws teraws etraws treaws rteaws ertaws retaws wstera swtera wtsera twsera stwera tswera wsetra swetra westra ewstra sewtra eswtra wtesra twesra wetsra ewtsra tewsra etwsra stewra tsewra setwra estwra teswra etswra wstrea swtrea wtsrea twsrea stwrea tswrea wsrtea swrtea wrstea rwstea srwtea rswtea wtrsea twrsea wrtsea rwtsea trwsea rtwsea strwea tsrwea srtwea rstwea trswea rtswea wserta swerta wesrta ewsrta sewrta eswrta wsreta swreta wrseta rwseta srweta rsweta wersta ewrsta wresta rwesta erwsta rewsta serwta esrwta srewta rsewta erswta reswta wtersa twersa wetrsa ewtrsa tewrsa etwrsa wtresa twresa wrtesa rwtesa trwesa rtwesa wertsa ewrtsa wretsa rwetsa erwtsa rewtsa terwsa etrwsa trewsa rtewsa ertwsa retwsa sterwa tserwa setrwa estrwa tesrwa etsrwa strewa tsrewa srtewa rstewa trsewa rtsewa sertwa esrtwa sretwa rsetwa erstwa restwa terswa etrswa treswa rteswa ertswa retswa asterw saterw atserw taserw staerw tsaerw asetrw saetrw aestrw eastrw seatrw esatrw atesrw taesrw aetsrw eatsrw teasrw etasrw stearw tsearw setarw estarw tesarw etsarw astrew satrew atsrew tasrew starew tsarew asrtew sartew arstew rastew sratew rsatew atrsew tarsew artsew ratsew trasew rtasew straew tsraew srtaew rstaew trsaew rtsaew asertw saertw aesrtw easrtw seartw esartw asretw saretw arsetw rasetw sraetw rsaetw aerstw earstw arestw raestw erastw reastw seratw esratw sreatw rseatw ersatw resatw atersw taersw aetrsw eatrsw tearsw etarsw atresw taresw artesw ratesw traesw rtaesw aertsw eartsw aretsw raetsw eratsw reatsw terasw etrasw treasw rteasw ertasw retasw steraw tseraw setraw estraw tesraw etsraw streaw tsreaw srteaw rsteaw trseaw rtseaw sertaw esrtaw sretaw rsetaw erstaw restaw tersaw etrsaw tresaw rtesaw ertsaw retsaw
Note: these 'words' (valid or invalid) are all the permutations of the word waster. These words are obtained by scrambling the letters in waster.