vowel ovwel vwoel wvoel owvel wovel voewl ovewl veowl evowl oevwl eovwl vweol wveol vewol evwol wevol ewvol owevl woevl oewvl eowvl weovl ewovl vowle ovwle vwole wvole owvle wovle volwe ovlwe vlowe lvowe olvwe lovwe vwloe wvloe vlwoe lvwoe wlvoe lwvoe owlve wolve olwve lowve wlove lwove voelw ovelw veolw evolw oevlw eovlw volew ovlew vloew lvoew olvew lovew velow evlow vleow lveow elvow levow oelvw eolvw olevw loevw elovw leovw vwelo wvelo vewlo evwlo wevlo ewvlo vwleo wvleo vlweo lvweo wlveo lwveo velwo evlwo vlewo lvewo elvwo levwo welvo ewlvo wlevo lwevo elwvo lewvo owelv woelv oewlv eowlv weolv ewolv owlev wolev olwev lowev wloev lwoev oelwv eolwv olewv loewv elowv leowv welov ewlov wleov lweov elwov lewov
Note: these 'words' (valid or invalid) are all the permutations of the word vowel. These words are obtained by scrambling the letters in vowel.