use '?' for JOKER (blank)

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

9 letter words

backdates[18]

8 letter words

backdate[17], backseat[16], seatback[16]

7 letter words

backset[15], setback[15], stacked[14]

6 letter words

backed[15], basked[13], casked[13], sacked[13], tacked[13], basket[12], casket[12], skated[11], staked[11], tasked[11], abased[9], abated[9], basted[9], cadets[9], abates[8]

5 letter words

aback[13], backs[13], becks[13], baked[12], caked[12], decks[12], bakes[11], beaks[11], cakes[11], stack[11], tacks[11], asked[10], tsked[10], katas[9], takas[9], skate[9], stake[9], steak[9], takes[9], teaks[9], baaed[8], based[8], beads[8], sabed[8], cades[8], cased[8], daces[8], bated[8], acted[8], cadet[8], debts[8], abase[7], abate[7], aceta[7], abets[7], baste[7], bates[7], beast[7], beats[7], betas[7], tabes[7], caste[7], cates[7], cesta[7], taces[7], dates[6], sated[6], stade[6], stead[6], tsade[6]

4 letter words

back[12], beck[12], deck[11], bake[10], beak[10], cake[10], bask[10], kabs[10], cask[10], sack[10], tack[10], daks[9], desk[9], cabs[8], scab[8], kaas[8], kaes[8], keas[8], sake[8], kata[8], taka[8], take[8], teak[8], kats[8], skat[8], task[8], abed[7], bade[7], bead[7], aced[7], cade[7], dace[7], bads[7], dabs[7], cads[7], scad[7], beds[7], debs[7], debt[7], abas[6], baas[6], casa[6], base[6], sabe[6], aces[6], case[6], acta[6], abet[6], bate[6], beat[6], beta[6], cate[6], tace[6], bast[6], bats[6], stab[6], tabs[6], acts[6], cast[6], cats[6], scat[6], best[6], bets[6], sect[6], sade[5], data[5], date[5], tads[5], teds[5], asea[4], ates[4], east[4], eats[4], etas[4], sate[4], seat[4], seta[4], teas[4]

3 letter words

kab[9], dak[8], cab[7], kae[7], kea[7], ask[7], kas[7], ska[7], kat[7], tsk[7], bad[6], dab[6], cad[6], bed[6], deb[6], aba[5], baa[5], ace[5], abs[5], bas[5], sab[5], sac[5], bes[5], sec[5], bat[5], tab[5], act[5], cat[5], bet[5], ads[4], sad[4], eds[4], tad[4], ted[4], aas[3], sae[3], sea[3], ate[3], eat[3], eta[3], tae[3], tea[3], sat[3], tas[3], set[3]

2 letter words

ab[4], ba[4], ad[3], aa[2], ae[2]