grubs rgubs gurbs ugrbs rugbs urgbs grbus rgbus gbrus bgrus rbgus brgus gubrs ugbrs gburs bgurs ubgrs bugrs rubgs urbgs rbugs brugs ubrgs burgs grusb rgusb gursb ugrsb rugsb urgsb grsub rgsub gsrub sgrub rsgub srgub gusrb ugsrb gsurb sgurb usgrb sugrb rusgb ursgb rsugb srugb usrgb surgb grbsu rgbsu gbrsu bgrsu rbgsu brgsu grsbu rgsbu gsrbu sgrbu rsgbu srgbu gbsru bgsru gsbru sgbru bsgru sbgru rbsgu brsgu rsbgu srbgu bsrgu sbrgu gubsr ugbsr gbusr bgusr ubgsr bugsr gusbr ugsbr gsubr sgubr usgbr sugbr gbsur bgsur gsbur sgbur bsgur sbgur ubsgr busgr usbgr subgr bsugr sbugr rubsg urbsg rbusg brusg ubrsg bursg rusbg ursbg rsubg srubg usrbg surbg rbsug brsug rsbug srbug bsrug sbrug ubsrg busrg usbrg subrg bsurg sburg
Note: these 'words' (valid or invalid) are all the permutations of the word grubs. These words are obtained by scrambling the letters in grubs.