owler woler olwer lower wloer lwoer owelr woelr oewlr eowlr weolr ewolr olewr loewr oelwr eolwr leowr elowr wleor lweor welor ewlor lewor elwor owlre wolre olwre lowre wlore lwore owrle worle orwle rowle wrole rwole olrwe lorwe orlwe rolwe lrowe rlowe wlroe lwroe wrloe rwloe lrwoe rlwoe owerl woerl oewrl eowrl weorl eworl owrel worel orwel rowel wroel rwoel oerwl eorwl orewl roewl erowl reowl werol ewrol wreol rweol erwol rewol olerw loerw oelrw eolrw leorw elorw olrew lorew orlew rolew lroew rloew oerlw eorlw orelw roelw erolw reolw lerow elrow lreow rleow erlow relow wlero lwero welro ewlro lewro elwro wlreo lwreo wrleo rwleo lrweo rlweo werlo ewrlo wrelo rwelo erwlo rewlo lerwo elrwo lrewo rlewo erlwo relwo
Note: these 'words' (valid or invalid) are all the permutations of the word owler. These words are obtained by scrambling the letters in owler.