radder ardder rdader drader adrder darder radder ardder rdader drader adrder darder rddaer drdaer rddaer drdaer ddraer ddraer addrer dadrer addrer dadrer ddarer ddarer radedr ardedr rdaedr draedr adredr daredr raeddr areddr readdr eraddr aerddr earddr rdeadr dreadr redadr erdadr deradr edradr aderdr daerdr aedrdr eadrdr deardr edardr radedr ardedr rdaedr draedr adredr daredr raeddr areddr readdr eraddr aerddr earddr rdeadr dreadr redadr erdadr deradr edradr aderdr daerdr aedrdr eadrdr deardr edardr rddear drdear rddear drdear ddrear ddrear rdedar dredar reddar erddar derdar edrdar rdedar dredar reddar erddar derdar edrdar dderar dderar dedrar eddrar dedrar eddrar adderr daderr adderr daderr ddaerr ddaerr adedrr daedrr aeddrr eaddrr deadrr edadrr adedrr daedrr aeddrr eaddrr deadrr edadrr ddearr ddearr dedarr eddarr dedarr eddarr raddre arddre rdadre dradre adrdre dardre raddre arddre rdadre dradre adrdre dardre rddare drdare rddare drdare ddrare ddrare addrre dadrre addrre dadrre ddarre ddarre radrde ardrde rdarde drarde adrrde darrde rardde arrdde rradde rradde arrdde rardde rdrade drrade rrdade rrdade drrade rdrade adrrde darrde ardrde radrde drarde rdarde radrde ardrde rdarde drarde adrrde darrde rardde arrdde rradde rradde arrdde rardde rdrade drrade rrdade rrdade drrade rdrade adrrde darrde ardrde radrde drarde rdarde rddrae drdrae rddrae drdrae ddrrae ddrrae rdrdae drrdae rrddae rrddae drrdae rdrdae rdrdae drrdae rrddae rrddae drrdae rdrdae ddrrae ddrrae drdrae rddrae drdrae rddrae addrre dadrre addrre dadrre ddarre ddarre adrdre dardre arddre raddre dradre rdadre adrdre dardre arddre raddre dradre rdadre ddrare ddrare drdare rddare drdare rddare raderd arderd rdaerd draerd adrerd darerd raedrd aredrd readrd eradrd aerdrd eardrd rdeard dreard redard erdard derard edrard aderrd daerrd aedrrd eadrrd dearrd edarrd radred ardred rdared drared adrred darred rarded arrded rraded rraded arrded rarded rdraed drraed rrdaed rrdaed drraed rdraed adrred darred ardred radred drared rdared raerdd arerdd reardd erardd aerrdd earrdd raredd arredd rraedd rraedd arredd raredd reradd erradd rreadd rreadd erradd reradd aerrdd earrdd arerdd raerdd erardd reardd rderad drerad redrad erdrad derrad edrrad rdread drread rrdead rrdead drread rdread rerdad errdad rredad rredad errdad rerdad derrad edrrad drerad rderad erdrad redrad aderrd daerrd aedrrd eadrrd dearrd edarrd adrerd darerd arderd raderd draerd rdaerd aerdrd eardrd aredrd raedrd eradrd readrd derard edrard dreard rdeard erdard redard raderd arderd rdaerd draerd adrerd darerd raedrd aredrd readrd eradrd aerdrd eardrd rdeard dreard redard erdard derard edrard aderrd daerrd aedrrd eadrrd dearrd edarrd radred ardred rdared drared adrred darred rarded arrded rraded rraded arrded rarded rdraed drraed rrdaed rrdaed drraed rdraed adrred darred ardred radred drared rdared raerdd arerdd reardd erardd aerrdd earrdd raredd arredd rraedd rraedd arredd raredd reradd erradd rreadd rreadd erradd reradd aerrdd earrdd arerdd raerdd erardd reardd rderad drerad redrad erdrad derrad edrrad rdread drread rrdead rrdead drread rdread rerdad errdad rredad rredad errdad rerdad derrad edrrad drerad rderad erdrad redrad aderrd daerrd aedrrd eadrrd dearrd edarrd adrerd darerd arderd raderd draerd rdaerd aerdrd eardrd aredrd raedrd eradrd readrd derard edrard dreard rdeard erdard redard rddera drdera rddera drdera ddrera ddrera rdedra dredra reddra erddra derdra edrdra rdedra dredra reddra erddra derdra edrdra dderra dderra dedrra eddrra dedrra eddrra rddrea drdrea rddrea drdrea ddrrea ddrrea rdrdea drrdea rrddea rrddea drrdea rdrdea rdrdea drrdea rrddea rrddea drrdea rdrdea ddrrea ddrrea drdrea rddrea drdrea rddrea rderda drerda redrda erdrda derrda edrrda rdreda drreda rrdeda rrdeda drreda rdreda rerdda errdda rredda rredda errdda rerdda derrda edrrda drerda rderda erdrda redrda rderda drerda redrda erdrda derrda edrrda rdreda drreda rrdeda rrdeda drreda rdreda rerdda errdda rredda rredda errdda rerdda derrda edrrda drerda rderda erdrda redrda dderra dderra dedrra eddrra dedrra eddrra ddrera ddrera drdera rddera drdera rddera derdra edrdra dredra rdedra erddra reddra derdra edrdra dredra rdedra erddra reddra adderr daderr adderr daderr ddaerr ddaerr adedrr daedrr aeddrr eaddrr deadrr edadrr adedrr daedrr aeddrr eaddrr deadrr edadrr ddearr ddearr dedarr eddarr dedarr eddarr addrer dadrer addrer dadrer ddarer ddarer adrder darder ardder radder drader rdader adrder darder ardder radder drader rdader ddraer ddraer drdaer rddaer drdaer rddaer aderdr daerdr aedrdr eadrdr deardr edardr adredr daredr ardedr radedr draedr rdaedr aerddr earddr areddr raeddr eraddr readdr deradr edradr dreadr rdeadr erdadr redadr aderdr daerdr aedrdr eadrdr deardr edardr adredr daredr ardedr radedr draedr rdaedr aerddr earddr areddr raeddr eraddr readdr deradr edradr dreadr rdeadr erdadr redadr dderar dderar dedrar eddrar dedrar eddrar ddrear ddrear drdear rddear drdear rddear derdar edrdar dredar rdedar erddar reddar derdar edrdar dredar rdedar erddar reddar
Note: these 'words' (valid or invalid) are all the permutations of the word radder. These words are obtained by scrambling the letters in radder.