use '?' for JOKER (blank)

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

13 letter words

backgrounding[24]

10 letter words

background[20]

9 letter words

undocking[17], unbraking[16], uncorking[16], brocading[15], unbracing[14], abounding[13], grounding[12]

8 letter words

cranking[15], croaking[15], uncaking[15], bunkoing[15], abducing[14], drouking[14], braconid[13], bouncing[13], buncoing[13], congaing[12], branding[12], boarding[12], uncaging[12], bounding[12], aborning[11], guarding[11], uncaring[11], airbound[11], unrobing[11], adorning[10], groaning[10], undaring[10], rigaudon[10], inground[10], rounding[10]

7 letter words

backing[16], bucking[16], burdock[16], docking[15], bannock[15], ducking[15], runback[15], banking[14], bonking[14], conking[14], nocking[14], barking[14], braking[14], arcking[14], carking[14], racking[14], dornick[14], borking[14], broking[14], corking[14], rocking[14], nudnick[14], bunking[14], burking[14], rucking[14], darking[13], dunking[13], badging[12], cadging[12], bracing[12], narking[12], ranking[12], budging[12], curbing[12], banding[11], dancing[11], banging[11], aboding[11], gonadic[11], bonding[11], condign[11], bonging[11], barding[11], brigand[11], carding[11], barging[11], garbing[11], gracing[11], corbina[11], cording[11], daubing[11], bunging[11], curding[11], caribou[11], danging[10], goading[10], nonacid[10], grading[10], niggard[10], barning[10], craning[10], inboard[10], organic[10], crannog[10], corning[10], dunging[10], nudging[10], inbound[10], unbraid[10], iracund[10], burning[10], candour[10], darning[9], ranging[9], adoring[9], droning[9], unaging[9], undoing[9], arguing[9], durning[9], aground[9], roguing[9], rouging[9], nondrug[9], unicorn[9], andiron[8], grunion[8]

6 letter words

baking[13], caking[13], bodkin[13], coking[13], kaonic[12], gingko[12], ginkgo[12], duking[12], daikon[11], bardic[11], raking[11], cubing[11], nudnik[11], unkind[11], nuking[11], cuboid[11], bonduc[11], caging[10], bandog[10], gobang[10], bonaci[10], boding[10], coding[10], carbon[10], corban[10], bicorn[10], bicron[10], unakin[10], baning[9], caning[9], anodic[9], bagnio[9], gabion[9], agonic[9], boning[9], coning[9], riband[9], rancid[9], baring[9], arcing[9], caring[9], racing[9], cardio[9], orgiac[9], roband[9], candor[9], cardon[9], dacron[9], barong[9], brogan[9], garcon[9], nordic[9], boring[9], orbing[9], robing[9], coring[9], unbind[9], abound[9], dugong[9], gundog[9], boudin[9], ganoid[8], noggin[8], daring[8], gradin[8], gringa[8], raging[8], dragon[8], goring[8], gringo[8], inborn[8], auding[8], guidon[8], inroad[7], ordain[7], oaring[7], onagri[7], origan[7], guanin[7]