circus icrcus cricus rcicus irccus riccus cicrus iccrus ccirus ccirus iccrus cicrus crcius rccius ccrius ccrius rccius crcius irccus riccus icrcus circus rcicus cricus cirucs icrucs criucs rciucs ircucs ricucs ciurcs icurcs cuircs ucircs iucrcs uicrcs cruics rcuics curics ucrics rucics urcics iruccs riuccs iurccs uirccs ruiccs uriccs cicurs iccurs cciurs cciurs iccurs cicurs ciucrs icucrs cuicrs ucicrs iuccrs uiccrs ccuirs ccuirs cucirs uccirs cucirs uccirs icucrs ciucrs iuccrs uiccrs cuicrs ucicrs crcuis rccuis ccruis ccruis rccuis crcuis crucis rcucis curcis ucrcis ruccis urccis ccuris ccuris cucris uccris cucris uccris rcucis crucis ruccis urccis curcis ucrcis ircucs ricucs icrucs cirucs rciucs criucs iruccs riuccs iurccs uirccs ruiccs uriccs icurcs ciurcs iucrcs uicrcs cuircs ucircs rcuics cruics rucics urcics curics ucrics circsu icrcsu cricsu rcicsu irccsu riccsu cicrsu iccrsu ccirsu ccirsu iccrsu cicrsu crcisu rccisu ccrisu ccrisu rccisu crcisu irccsu riccsu icrcsu circsu rcicsu cricsu cirscu icrscu criscu rciscu ircscu ricscu cisrcu icsrcu csircu scircu iscrcu sicrcu crsicu rcsicu csricu scricu rscicu srcicu irsccu risccu isrccu sirccu rsiccu sriccu cicsru iccsru ccisru ccisru iccsru cicsru ciscru icscru csicru scicru isccru siccru ccsiru ccsiru csciru scciru csciru scciru icscru ciscru isccru siccru csicru scicru crcsiu rccsiu ccrsiu ccrsiu rccsiu crcsiu crsciu rcsciu csrciu scrciu rscciu srcciu ccsriu ccsriu cscriu sccriu cscriu sccriu rcsciu crsciu rscciu srcciu csrciu scrciu ircscu ricscu icrscu cirscu rciscu criscu irsccu risccu isrccu sirccu rsiccu sriccu icsrcu cisrcu iscrcu sicrcu csircu scircu rcsicu crsicu rscicu srcicu csricu scricu cirusc icrusc criusc rciusc ircusc ricusc ciursc icursc cuirsc ucirsc iucrsc uicrsc cruisc rcuisc curisc ucrisc rucisc urcisc irucsc riucsc iurcsc uircsc ruicsc uricsc cirsuc icrsuc crisuc rcisuc ircsuc ricsuc cisruc icsruc csiruc sciruc iscruc sicruc crsiuc rcsiuc csriuc scriuc rsciuc srciuc irscuc riscuc isrcuc sircuc rsicuc sricuc ciusrc icusrc cuisrc ucisrc iucsrc uicsrc cisurc icsurc csiurc sciurc iscurc sicurc cusirc ucsirc csuirc scuirc uscirc sucirc iuscrc uiscrc isucrc siucrc usicrc suicrc crusic rcusic cursic ucrsic rucsic urcsic crsuic rcsuic csruic scruic rscuic srcuic cusric ucsric csuric scuric uscric sucric ruscic urscic rsucic srucic usrcic surcic iruscc riuscc iurscc uirscc ruiscc uriscc irsucc risucc isrucc sirucc rsiucc sriucc iusrcc uisrcc isurcc siurcc usircc suircc rusicc ursicc rsuicc sruicc usricc suricc cicusr iccusr cciusr cciusr iccusr cicusr ciucsr icucsr cuicsr ucicsr iuccsr uiccsr ccuisr ccuisr cucisr uccisr cucisr uccisr icucsr ciucsr iuccsr uiccsr cuicsr ucicsr cicsur iccsur ccisur ccisur iccsur cicsur ciscur icscur csicur scicur isccur siccur ccsiur ccsiur csciur scciur csciur scciur icscur ciscur isccur siccur csicur scicur ciuscr icuscr cuiscr uciscr iucscr uicscr cisucr icsucr csiucr sciucr iscucr sicucr cusicr ucsicr csuicr scuicr uscicr sucicr iusccr uisccr isuccr siuccr usiccr suiccr ccusir ccusir cucsir uccsir cucsir uccsir ccsuir ccsuir cscuir sccuir cscuir sccuir cuscir ucscir csucir scucir usccir succir cuscir ucscir csucir scucir usccir succir icuscr ciuscr iucscr uicscr cuiscr uciscr icsucr cisucr iscucr sicucr csiucr sciucr iusccr uisccr isuccr siuccr usiccr suiccr cusicr ucsicr csuicr scuicr uscicr sucicr crcusi rccusi ccrusi ccrusi rccusi crcusi crucsi rcucsi curcsi ucrcsi ruccsi urccsi ccursi ccursi cucrsi uccrsi cucrsi uccrsi rcucsi crucsi ruccsi urccsi curcsi ucrcsi crcsui rccsui ccrsui ccrsui rccsui crcsui crscui rcscui csrcui scrcui rsccui srccui ccsrui ccsrui cscrui sccrui cscrui sccrui rcscui crscui rsccui srccui csrcui scrcui crusci rcusci cursci ucrsci rucsci urcsci crsuci rcsuci csruci scruci rscuci srcuci cusrci ucsrci csurci scurci uscrci sucrci ruscci urscci rsucci srucci usrcci surcci ccusri ccusri cucsri uccsri cucsri uccsri ccsuri ccsuri cscuri sccuri cscuri sccuri cuscri ucscri csucri scucri usccri succri cuscri ucscri csucri scucri usccri succri rcusci crusci rucsci urcsci cursci ucrsci rcsuci crsuci rscuci srcuci csruci scruci ruscci urscci rsucci srucci usrcci surcci cusrci ucsrci csurci scurci uscrci sucrci ircusc ricusc icrusc cirusc rciusc criusc irucsc riucsc iurcsc uircsc ruicsc uricsc icursc ciursc iucrsc uicrsc cuirsc ucirsc rcuisc cruisc rucisc urcisc curisc ucrisc ircsuc ricsuc icrsuc cirsuc rcisuc crisuc irscuc riscuc isrcuc sircuc rsicuc sricuc icsruc cisruc iscruc sicruc csiruc sciruc rcsiuc crsiuc rsciuc srciuc csriuc scriuc iruscc riuscc iurscc uirscc ruiscc uriscc irsucc risucc isrucc sirucc rsiucc sriucc iusrcc uisrcc isurcc siurcc usircc suircc rusicc ursicc rsuicc sruicc usricc suricc icusrc ciusrc iucsrc uicsrc cuisrc ucisrc icsurc cisurc iscurc sicurc csiurc sciurc iuscrc uiscrc isucrc siucrc usicrc suicrc cusirc ucsirc csuirc scuirc uscirc sucirc rcusic crusic rucsic urcsic cursic ucrsic rcsuic crsuic rscuic srcuic csruic scruic ruscic urscic rsucic srucic usrcic surcic cusric ucsric csuric scuric uscric sucric
Note: these 'words' (valid or invalid) are all the permutations of the word circus. These words are obtained by scrambling the letters in circus.