grump rgump gurmp ugrmp rugmp urgmp grmup rgmup gmrup mgrup rmgup mrgup gumrp ugmrp gmurp mgurp umgrp mugrp rumgp urmgp rmugp mrugp umrgp murgp grupm rgupm gurpm ugrpm rugpm urgpm grpum rgpum gprum pgrum rpgum prgum guprm ugprm gpurm pgurm upgrm pugrm rupgm urpgm rpugm prugm uprgm purgm grmpu rgmpu gmrpu mgrpu rmgpu mrgpu grpmu rgpmu gprmu pgrmu rpgmu prgmu gmpru mgpru gpmru pgmru mpgru pmgru rmpgu mrpgu rpmgu prmgu mprgu pmrgu gumpr ugmpr gmupr mgupr umgpr mugpr gupmr ugpmr gpumr pgumr upgmr pugmr gmpur mgpur gpmur pgmur mpgur pmgur umpgr mupgr upmgr pumgr mpugr pmugr rumpg urmpg rmupg mrupg umrpg murpg rupmg urpmg rpumg prumg uprmg purmg rmpug mrpug rpmug prmug mprug pmrug umprg muprg upmrg pumrg mpurg pmurg
Note: these 'words' (valid or invalid) are all the permutations of the word grump. These words are obtained by scrambling the letters in grump.