oncer nocer ocner coner ncoer cnoer onecr noecr oencr eoncr neocr enocr ocenr coenr oecnr eocnr ceonr econr nceor cneor necor encor cenor ecnor oncre nocre ocnre conre ncore cnore onrce norce ornce ronce nroce rnoce ocrne corne orcne rocne crone rcone ncroe cnroe nrcoe rncoe crnoe rcnoe onerc noerc oenrc eonrc neorc enorc onrec norec ornec ronec nroec rnoec oernc eornc orenc roenc eronc reonc neroc enroc nreoc rneoc ernoc renoc ocern coern oecrn eocrn ceorn ecorn ocren coren orcen rocen croen rcoen oercn eorcn orecn roecn erocn reocn ceron ecron creon rceon ercon recon ncero cnero necro encro cenro ecnro ncreo cnreo nrceo rnceo crneo rcneo nerco enrco nreco rneco ernco renco cerno ecrno creno rceno ercno recno
Note: these 'words' (valid or invalid) are all the permutations of the word oncer. These words are obtained by scrambling the letters in oncer.