cirrus icrrus crirus rcirus ircrus ricrus cirrus icrrus crirus rcirus ircrus ricrus crrius rcrius crrius rcrius rrcius rrcius irrcus rircus irrcus rircus rricus rricus cirurs icrurs criurs rciurs ircurs ricurs ciurrs icurrs cuirrs ucirrs iucrrs uicrrs cruirs rcuirs curirs ucrirs rucirs urcirs irucrs riucrs iurcrs uircrs ruicrs uricrs cirurs icrurs criurs rciurs ircurs ricurs ciurrs icurrs cuirrs ucirrs iucrrs uicrrs cruirs rcuirs curirs ucrirs rucirs urcirs irucrs riucrs iurcrs uircrs ruicrs uricrs crruis rcruis crruis rcruis rrcuis rrcuis cruris rcuris curris ucrris rucris urcris cruris rcuris curris ucrris rucris urcris rrucis rrucis rurcis urrcis rurcis urrcis irrucs rirucs irrucs rirucs rriucs rriucs irurcs riurcs iurrcs uirrcs ruircs urircs irurcs riurcs iurrcs uirrcs ruircs urircs rruics rruics rurics urrics rurics urrics cirrsu icrrsu crirsu rcirsu ircrsu ricrsu cirrsu icrrsu crirsu rcirsu ircrsu ricrsu crrisu rcrisu crrisu rcrisu rrcisu rrcisu irrcsu rircsu irrcsu rircsu rricsu rricsu cirsru icrsru crisru rcisru ircsru ricsru cisrru icsrru csirru scirru iscrru sicrru crsiru rcsiru csriru scriru rsciru srciru irscru riscru isrcru sircru rsicru sricru cirsru icrsru crisru rcisru ircsru ricsru cisrru icsrru csirru scirru iscrru sicrru crsiru rcsiru csriru scriru rsciru srciru irscru riscru isrcru sircru rsicru sricru crrsiu rcrsiu crrsiu rcrsiu rrcsiu rrcsiu crsriu rcsriu csrriu scrriu rscriu srcriu crsriu rcsriu csrriu scrriu rscriu srcriu rrsciu rrsciu rsrciu srrciu rsrciu srrciu irrscu rirscu irrscu rirscu rriscu rriscu irsrcu risrcu isrrcu sirrcu rsircu srircu irsrcu risrcu isrrcu sirrcu rsircu srircu rrsicu rrsicu rsricu srricu rsricu srricu cirusr icrusr criusr rciusr ircusr ricusr ciursr icursr cuirsr ucirsr iucrsr uicrsr cruisr rcuisr curisr ucrisr rucisr urcisr irucsr riucsr iurcsr uircsr ruicsr uricsr cirsur icrsur crisur rcisur ircsur ricsur cisrur icsrur csirur scirur iscrur sicrur crsiur rcsiur csriur scriur rsciur srciur irscur riscur isrcur sircur rsicur sricur ciusrr icusrr cuisrr ucisrr iucsrr uicsrr cisurr icsurr csiurr sciurr iscurr sicurr cusirr ucsirr csuirr scuirr uscirr sucirr iuscrr uiscrr isucrr siucrr usicrr suicrr crusir rcusir cursir ucrsir rucsir urcsir crsuir rcsuir csruir scruir rscuir srcuir cusrir ucsrir csurir scurir uscrir sucrir ruscir urscir rsucir srucir usrcir surcir iruscr riuscr iurscr uirscr ruiscr uriscr irsucr risucr isrucr sirucr rsiucr sriucr iusrcr uisrcr isurcr siurcr usircr suircr rusicr ursicr rsuicr sruicr usricr suricr cirusr icrusr criusr rciusr ircusr ricusr ciursr icursr cuirsr ucirsr iucrsr uicrsr cruisr rcuisr curisr ucrisr rucisr urcisr irucsr riucsr iurcsr uircsr ruicsr uricsr cirsur icrsur crisur rcisur ircsur ricsur cisrur icsrur csirur scirur iscrur sicrur crsiur rcsiur csriur scriur rsciur srciur irscur riscur isrcur sircur rsicur sricur ciusrr icusrr cuisrr ucisrr iucsrr uicsrr cisurr icsurr csiurr sciurr iscurr sicurr cusirr ucsirr csuirr scuirr uscirr sucirr iuscrr uiscrr isucrr siucrr usicrr suicrr crusir rcusir cursir ucrsir rucsir urcsir crsuir rcsuir csruir scruir rscuir srcuir cusrir ucsrir csurir scurir uscrir sucrir ruscir urscir rsucir srucir usrcir surcir iruscr riuscr iurscr uirscr ruiscr uriscr irsucr risucr isrucr sirucr rsiucr sriucr iusrcr uisrcr isurcr siurcr usircr suircr rusicr ursicr rsuicr sruicr usricr suricr crrusi rcrusi crrusi rcrusi rrcusi rrcusi crursi rcursi currsi ucrrsi rucrsi urcrsi crursi rcursi currsi ucrrsi rucrsi urcrsi rrucsi rrucsi rurcsi urrcsi rurcsi urrcsi crrsui rcrsui crrsui rcrsui rrcsui rrcsui crsrui rcsrui csrrui scrrui rscrui srcrui crsrui rcsrui csrrui scrrui rscrui srcrui rrscui rrscui rsrcui srrcui rsrcui srrcui crusri rcusri cursri ucrsri rucsri urcsri crsuri rcsuri csruri scruri rscuri srcuri cusrri ucsrri csurri scurri uscrri sucrri ruscri urscri rsucri srucri usrcri surcri crusri rcusri cursri ucrsri rucsri urcsri crsuri rcsuri csruri scruri rscuri srcuri cusrri ucsrri csurri scurri uscrri sucrri ruscri urscri rsucri srucri usrcri surcri rrusci rrusci rursci urrsci rursci urrsci rrsuci rrsuci rsruci srruci rsruci srruci rusrci ursrci rsurci srurci usrrci surrci rusrci ursrci rsurci srurci usrrci surrci irrusc rirusc irrusc rirusc rriusc rriusc irursc riursc iurrsc uirrsc ruirsc urirsc irursc riursc iurrsc uirrsc ruirsc urirsc rruisc rruisc rurisc urrisc rurisc urrisc irrsuc rirsuc irrsuc rirsuc rrisuc rrisuc irsruc risruc isrruc sirruc rsiruc sriruc irsruc risruc isrruc sirruc rsiruc sriruc rrsiuc rrsiuc rsriuc srriuc rsriuc srriuc irusrc riusrc iursrc uirsrc ruisrc urisrc irsurc risurc isrurc sirurc rsiurc sriurc iusrrc uisrrc isurrc siurrc usirrc suirrc rusirc ursirc rsuirc sruirc usrirc surirc irusrc riusrc iursrc uirsrc ruisrc urisrc irsurc risurc isrurc sirurc rsiurc sriurc iusrrc uisrrc isurrc siurrc usirrc suirrc rusirc ursirc rsuirc sruirc usrirc surirc rrusic rrusic rursic urrsic rursic urrsic rrsuic rrsuic rsruic srruic rsruic srruic rusric ursric rsuric sruric usrric surric rusric ursric rsuric sruric usrric surric
Note: these 'words' (valid or invalid) are all the permutations of the word cirrus. These words are obtained by scrambling the letters in cirrus.