lucre ulcre lcure clure uclre culre lurce ulrce lruce rluce urlce rulce lcrue clrue lrcue rlcue crlue rclue ucrle curle urcle rucle crule rcule lucer ulcer lcuer cluer ucler culer luecr ulecr leucr elucr uelcr eulcr lceur cleur lecur elcur celur eclur ucelr cuelr ueclr euclr ceulr eculr lurec ulrec lruec rluec urlec rulec luerc ulerc leurc elurc uelrc eulrc lreuc rleuc leruc elruc reluc erluc urelc ruelc uerlc eurlc reulc erulc lcreu clreu lrceu rlceu crleu rcleu lceru cleru lecru elcru celru eclru lrecu rlecu lercu elrcu relcu erlcu crelu rcelu cerlu ecrlu reclu erclu ucrel curel urcel rucel cruel rcuel ucerl cuerl uecrl eucrl ceurl ecurl urecl ruecl uercl eurcl reucl erucl creul rceul cerul ecrul recul ercul
Note: these 'words' (valid or invalid) are all the permutations of the word lucre. These words are obtained by scrambling the letters in lucre.