graud rgaud garud agrud ragud argud gruad rguad gurad ugrad rugad urgad gaurd agurd guard ugard augrd uagrd raugd arugd ruagd uragd aurgd uargd gradu rgadu gardu agrdu ragdu argdu grdau rgdau gdrau dgrau rdgau drgau gadru agdru gdaru dgaru adgru dagru radgu ardgu rdagu dragu adrgu dargu gruda rguda gurda ugrda rugda urgda grdua rgdua gdrua dgrua rdgua drgua gudra ugdra gdura dgura udgra dugra rudga urdga rduga druga udrga durga gaudr agudr guadr ugadr augdr uagdr gadur agdur gdaur dgaur adgur dagur gudar ugdar gduar dguar udgar dugar audgr uadgr adugr daugr udagr duagr raudg arudg ruadg uradg aurdg uardg radug ardug rdaug draug adrug darug rudag urdag rduag druag udrag durag audrg uadrg adurg daurg udarg duarg
Note: these 'words' (valid or invalid) are all the permutations of the word graud. These words are obtained by scrambling the letters in graud.