use '?' for JOKER (blank)

From letters B, L, A, C, K, G, U, A, R, D, I, N, G  I made following words

13 letter words

blackguarding[24]

10 letter words

blackguard[20]

8 letter words

backland[17], blacking[17], baldrick[17], bankcard[17], buckling[17], duckling[16], blinkard[15], baulking[15], caulking[15], kludging[15], ruckling[15], darkling[14], abducing[14], aldicarb[13], kraaling[13], bicaudal[13], bludging[13], abrading[12], arcading[12], carangid[12], cardigan[12], landgrab[12], cradling[12], garbling[12], curdling[12], burgling[12], cardinal[11], craaling[11], dulciana[11], guarding[11], cingular[11], gangliar[10], guardian[10], binaural[10]

7 letter words

backing[16], bucking[16], ducking[15], runback[15], balking[14], calking[14], lacking[14], bidarka[14], barking[14], braking[14], arcking[14], carking[14], racking[14], bulking[14], lucking[14], burking[14], rucking[14], clarkia[13], darking[13], kluging[13], aggadic[12], badging[12], cadging[12], cabling[12], carabid[12], baldric[12], bracing[12], larking[12], budging[12], curbing[12], lurking[12], balding[11], blading[11], gabling[11], carabin[11], barding[11], brigand[11], carding[11], barging[11], garbing[11], gracing[11], daubing[11], bugling[11], bulging[11], curding[11], laggard[10], radical[10], bargain[10], grading[10], niggard[10], blaring[10], carling[10], incudal[10], cingula[10], unbraid[10], iracund[10], burling[10], curling[10], ganglia[9], garland[9], carinal[9], cranial[9], darling[9], larding[9], argling[9], glaring[9], languid[9], lauding[9], gradual[9], arguing[9], canular[9], lacunar[9], laniard[8], nadiral[8], guarani[8], angular[8], diurnal[8]

6 letter words

buckra[14], baking[13], caking[13], calkin[12], gagaku[12], duking[12], laking[11], bardic[11], raking[11], cubing[11], caging[10], kalian[10], ragbag[10], arabic[10], kinara[10], bacula[10], abulic[10], uakari[10], lubric[10], indaba[9], baaing[9], baling[9], lacing[9], acarid[9], cardia[9], airbag[9], agaric[9], bridal[9], ribald[9], garlic[9], canard[9], riband[9], rancid[9], baring[9], arcing[9], caring[9], racing[9], guaiac[9], caudal[9], unclad[9], glucan[9], bluing[9], lubing[9], cluing[9], lading[8], ligand[8], gingal[8], gardai[8], racial[8], acinar[8], arnica[8], carina[8], crania[8], daring[8], gradin[8], gringa[8], raging[8], carnal[8], carlin[8], abulia[8], auding[8], canula[8], lacuna[8], uncial[8], gluing[8], luging[8], burial[8], curial[8], uracil[8], anuric[8], agnail[7], radial[7], argali[7], radian[7], raglan[7], aldrin[7], audial[7], iguana[7], landau[7], laguna[7], unlaid[7], lingua[7], nilgau[7], radula[7], narial[6], anuria[6], urania[6]