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