use '?' for JOKER (blank)

From letters B, A, C, K, B, I, T, E, S  I made following words

9 letter words

backbites[19]

8 letter words

backbite[18], tiebacks[16]

7 letter words

backbit[17], tieback[15], backset[15], setback[15], cabbies[13], cakiest[13], babiest[11], tabbies[11]

6 letter words

kebabs[14], kibbes[14], cabbie[12], basket[12], casket[12], batiks[12], babies[10], ceibas[10], tabbis[10], bisect[10]

5 letter words

kebab[13], kibbe[13], backs[13], becks[13], bakes[11], beaks[11], cakes[11], bikes[11], kibes[11], batik[11], stack[11], tacks[11], stick[11], ticks[11], ceiba[9], abbes[9], babes[9], basic[9], bices[9], skate[9], stake[9], steak[9], takes[9], teaks[9], ikats[9], kites[9], skite[9], tikes[9], saice[7], abets[7], baste[7], bates[7], beast[7], beats[7], betas[7], tabes[7], caste[7], cates[7], cesta[7], taces[7], baits[7], bites[7], cesti[7], cites[7]

4 letter words

back[12], beck[12], bake[10], beak[10], cake[10], bike[10], kibe[10], bask[10], kabs[10], cask[10], sack[10], bisk[10], sick[10], tack[10], tick[10], abbe[8], babe[8], bice[8], cabs[8], scab[8], ebbs[8], bibs[8], sibb[8], kaes[8], keas[8], sake[8], saki[8], sika[8], sike[8], take[8], teak[8], ikat[8], kite[8], tike[8], kats[8], skat[8], task[8], kist[8], kits[8], skit[8], base[6], sabe[6], aces[6], case[6], bias[6], isba[6], asci[6], bise[6], ices[6], sice[6], abet[6], bate[6], beat[6], beta[6], cate[6], tace[6], bait[6], bite[6], cite[6], etic[6], bast[6], bats[6], stab[6], tabs[6], acts[6], cast[6], cats[6], scat[6], best[6], bets[6], sect[6], bits[6], cist[6], tics[6], ates[4], east[4], eats[4], etas[4], sate[4], seat[4], seta[4], teas[4], aits[4], sati[4], site[4], ties[4]

3 letter words

kab[9], ick[9], cab[7], ebb[7], bib[7], kae[7], kea[7], ask[7], kas[7], ska[7], kis[7], ski[7], kat[7], kit[7], ace[5], ice[5], abs[5], bas[5], sab[5], sac[5], bes[5], sec[5], bis[5], sib[5], cis[5], sic[5], bat[5], tab[5], act[5], cat[5], bet[5], bit[5], tic[5], sae[3], sea[3], ais[3], sei[3], ate[3], eat[3], eta[3], tae[3], tea[3], ait[3], tie[3], sat[3], tas[3], set[3], its[3], sit[3]