trucks rtucks turcks utrcks rutcks urtcks trcuks rtcuks tcruks ctruks rctuks crtuks tucrks utcrks tcurks cturks uctrks cutrks ructks urctks rcutks crutks ucrtks curtks trukcs rtukcs turkcs utrkcs rutkcs urtkcs trkucs rtkucs tkrucs ktrucs rktucs krtucs tukrcs utkrcs tkurcs kturcs uktrcs kutrcs ruktcs urktcs rkutcs krutcs ukrtcs kurtcs trckus rtckus tcrkus ctrkus rctkus crtkus trkcus rtkcus tkrcus ktrcus rktcus krtcus tckrus ctkrus tkcrus ktcrus cktrus kctrus rcktus crktus rkctus krctus ckrtus kcrtus tuckrs utckrs tcukrs ctukrs uctkrs cutkrs tukcrs utkcrs tkucrs ktucrs uktcrs kutcrs tckurs ctkurs tkcurs ktcurs ckturs kcturs ucktrs cuktrs ukctrs kuctrs ckutrs kcutrs ruckts urckts rcukts crukts ucrkts curkts rukcts urkcts rkucts kructs ukrcts kurcts rckuts crkuts rkcuts krcuts ckruts kcruts uckrts cukrts ukcrts kucrts ckurts kcurts trucsk rtucsk turcsk utrcsk rutcsk urtcsk trcusk rtcusk tcrusk ctrusk rctusk crtusk tucrsk utcrsk tcursk ctursk uctrsk cutrsk ructsk urctsk rcutsk crutsk ucrtsk curtsk trusck rtusck tursck utrsck rutsck urtsck trsuck rtsuck tsruck struck rstuck srtuck tusrck utsrck tsurck sturck ustrck sutrck rustck urstck rsutck srutck usrtck surtck trcsuk rtcsuk tcrsuk ctrsuk rctsuk crtsuk trscuk rtscuk tsrcuk strcuk rstcuk srtcuk tcsruk ctsruk tscruk stcruk cstruk sctruk rcstuk crstuk rsctuk srctuk csrtuk scrtuk tucsrk utcsrk tcusrk ctusrk uctsrk cutsrk tuscrk utscrk tsucrk stucrk ustcrk sutcrk tcsurk ctsurk tscurk stcurk csturk scturk ucstrk custrk usctrk suctrk csutrk scutrk rucstk urcstk rcustk crustk ucrstk curstk rusctk ursctk rsuctk sructk usrctk surctk rcsutk crsutk rscutk srcutk csrutk scrutk ucsrtk cusrtk uscrtk sucrtk csurtk scurtk truksc rtuksc turksc utrksc rutksc urtksc trkusc rtkusc tkrusc ktrusc rktusc krtusc tukrsc utkrsc tkursc ktursc uktrsc kutrsc ruktsc urktsc rkutsc krutsc ukrtsc kurtsc truskc rtuskc turskc utrskc rutskc urtskc trsukc rtsukc tsrukc strukc rstukc srtukc tusrkc utsrkc tsurkc sturkc ustrkc sutrkc rustkc urstkc rsutkc srutkc usrtkc surtkc trksuc rtksuc tkrsuc ktrsuc rktsuc krtsuc trskuc rtskuc tsrkuc strkuc rstkuc srtkuc tksruc ktsruc tskruc stkruc kstruc sktruc rkstuc krstuc rsktuc srktuc ksrtuc skrtuc tuksrc utksrc tkusrc ktusrc uktsrc kutsrc tuskrc utskrc tsukrc stukrc ustkrc sutkrc tksurc ktsurc tskurc stkurc ksturc skturc ukstrc kustrc usktrc suktrc ksutrc skutrc rukstc urkstc rkustc krustc ukrstc kurstc rusktc ursktc rsuktc sruktc usrktc surktc rksutc krsutc rskutc srkutc ksrutc skrutc uksrtc kusrtc uskrtc sukrtc ksurtc skurtc trcksu rtcksu tcrksu ctrksu rctksu crtksu trkcsu rtkcsu tkrcsu ktrcsu rktcsu krtcsu tckrsu ctkrsu tkcrsu ktcrsu cktrsu kctrsu rcktsu crktsu rkctsu krctsu ckrtsu kcrtsu trcsku rtcsku tcrsku ctrsku rctsku crtsku trscku rtscku tsrcku strcku rstcku srtcku tcsrku ctsrku tscrku stcrku cstrku sctrku rcstku crstku rsctku srctku csrtku scrtku trkscu rtkscu tkrscu ktrscu rktscu krtscu trskcu rtskcu tsrkcu strkcu rstkcu srtkcu tksrcu ktsrcu tskrcu stkrcu kstrcu sktrcu rkstcu krstcu rsktcu srktcu ksrtcu skrtcu tcksru ctksru tkcsru ktcsru cktsru kctsru tcskru ctskru tsckru stckru cstkru sctkru tkscru ktscru tskcru stkcru kstcru sktcru ckstru kcstru csktru scktru ksctru skctru rckstu crkstu rkcstu krcstu ckrstu kcrstu rcsktu crsktu rscktu srcktu csrktu scrktu rksctu krsctu rskctu srkctu ksrctu skrctu cksrtu kcsrtu cskrtu sckrtu kscrtu skcrtu tucksr utcksr tcuksr ctuksr uctksr cutksr tukcsr utkcsr tkucsr ktucsr uktcsr kutcsr tckusr ctkusr tkcusr ktcusr cktusr kctusr ucktsr cuktsr ukctsr kuctsr ckutsr kcutsr tucskr utcskr tcuskr ctuskr uctskr cutskr tusckr utsckr tsuckr stuckr ustckr sutckr tcsukr ctsukr tscukr stcukr cstukr sctukr ucstkr custkr usctkr suctkr csutkr scutkr tukscr utkscr tkuscr ktuscr uktscr kutscr tuskcr utskcr tsukcr stukcr ustkcr sutkcr tksucr ktsucr tskucr stkucr kstucr sktucr ukstcr kustcr usktcr suktcr ksutcr skutcr tcksur ctksur tkcsur ktcsur cktsur kctsur tcskur ctskur tsckur stckur cstkur sctkur tkscur ktscur tskcur stkcur kstcur sktcur ckstur kcstur csktur scktur ksctur skctur uckstr cukstr ukcstr kucstr ckustr kcustr ucsktr cusktr uscktr sucktr csuktr scuktr uksctr kusctr uskctr sukctr ksuctr skuctr cksutr kcsutr cskutr sckutr kscutr skcutr ruckst urckst rcukst crukst ucrkst curkst rukcst urkcst rkucst krucst ukrcst kurcst rckust crkust rkcust krcust ckrust kcrust uckrst cukrst ukcrst kucrst ckurst kcurst rucskt urcskt rcuskt cruskt ucrskt curskt rusckt ursckt rsuckt sruckt usrckt surckt rcsukt crsukt rscukt srcukt csrukt scrukt ucsrkt cusrkt uscrkt sucrkt csurkt scurkt ruksct urksct rkusct krusct ukrsct kursct ruskct urskct rsukct srukct usrkct surkct rksuct krsuct rskuct srkuct ksruct skruct uksrct kusrct uskrct sukrct ksurct skurct rcksut crksut rkcsut krcsut ckrsut kcrsut rcskut crskut rsckut srckut csrkut scrkut rkscut krscut rskcut srkcut ksrcut skrcut cksrut kcsrut cskrut sckrut kscrut skcrut ucksrt cuksrt ukcsrt kucsrt ckusrt kcusrt ucskrt cuskrt usckrt suckrt csukrt scukrt ukscrt kuscrt uskcrt sukcrt ksucrt skucrt cksurt kcsurt cskurt sckurt kscurt skcurt
Note: these 'words' (valid or invalid) are all the permutations of the word trucks. These words are obtained by scrambling the letters in trucks.