ceros ecros creos rceos ercos recos ceors ecors coers ocers eocrs oecrs croes rcoes cores ocres roces orces erocs reocs eorcs oercs roecs orecs cerso ecrso creso rceso ercso recso cesro ecsro csero scero escro secro crseo rcseo csreo screo rsceo srceo ersco resco esrco serco rseco sreco ceosr ecosr coesr ocesr eocsr oecsr cesor ecsor cseor sceor escor secor coser ocser csoer scoer oscer socer eoscr oescr esocr seocr osecr soecr crose rcose corse ocrse rocse orcse crsoe rcsoe csroe scroe rscoe srcoe cosre ocsre csore score oscre socre rosce orsce rsoce sroce osrce sorce erosc reosc eorsc oersc roesc oresc ersoc resoc esroc seroc rseoc sreoc eosrc oesrc esorc seorc oserc soerc rosec orsec rsoec sroec osrec sorec
Note: these 'words' (valid or invalid) are all the permutations of the word ceros. These words are obtained by scrambling the letters in ceros.