grade rgade garde agrde ragde argde grdae rgdae gdrae dgrae rdgae drgae gadre agdre gdare dgare adgre dagre radge ardge rdage drage adrge darge graed rgaed gared agred raged arged gread rgead gerad egrad regad ergad gaerd agerd geard egard aegrd eagrd raegd aregd reagd eragd aergd eargd grdea rgdea gdrea dgrea rdgea drgea greda rgeda gerda egrda regda ergda gdera dgera gedra egdra degra edgra rdega drega redga erdga derga edrga gader agder gdaer dgaer adger dager gaedr agedr geadr egadr aegdr eagdr gdear dgear gedar egdar degar edgar adegr daegr aedgr eadgr deagr edagr radeg ardeg rdaeg draeg adreg dareg raedg aredg readg eradg aerdg eardg rdeag dreag redag erdag derag edrag aderg daerg aedrg eadrg dearg edarg
Note: these 'words' (valid or invalid) are all the permutations of the word grade. These words are obtained by scrambling the letters in grade.