use '?' for JOKER (blank)

From letters C, A, R, B, U, R, E, T, T, E, R  I made following words

11 letter words

carburetter[15]

8 letter words

carburet[12], barterer[10], retracer[10], barrette[10], batterer[10], berretta[10], creature[10], eructate[10], rebutter[10]

7 letter words

acerber[11], cerebra[11], rebater[9], caterer[9], recrate[9], retrace[9], terrace[9], abetter[9], beretta[9], retract[9], abutter[9], curtate[9], burette[9], curette[9], retreat[7], treater[7], reutter[7], utterer[7]

6 letter words

bracer[10], rubace[10], curber[10], bearer[8], career[8], beater[8], berate[8], rebate[8], cerate[8], create[8], ecarte[8], barret[8], barter[8], carter[8], crater[8], tracer[8], batter[8], better[8], tercet[8], curare[8], burrer[8], arbute[8], acuter[8], curate[8], curter[8], battue[8], tubate[8], butter[8], cutter[8], rearer[6], retear[6], tearer[6], terrae[6], ratter[6], tarter[6], terret[6], ureter[6], tauter[6], turret[6]

5 letter words

acerb[9], brace[9], caber[9], rebec[9], bract[9], cuber[9], barer[7], barre[7], rebar[7], carer[7], racer[7], taber[7], caret[7], carte[7], cater[7], crate[7], react[7], recta[7], trace[7], beret[7], erect[7], terce[7], betta[7], tacet[7], tecta[7], tract[7], crura[7], curer[7], recur[7], beaut[7], tubae[7], acute[7], brute[7], buret[7], rebut[7], tuber[7], cruet[7], curet[7], cuter[7], eruct[7], recut[7], truce[7], battu[7], butte[7], rarer[5], arete[5], eater[5], rater[5], tarre[5], terra[5], tater[5], tetra[5], treat[5], urare[5], urate[5], truer[5], tutee[5], utter[5]

4 letter words

carb[8], crab[8], cube[8], curb[8], bare[6], bear[6], brae[6], acre[6], care[6], race[6], beer[6], bree[6], cere[6], carr[6], brrr[6], abet[6], bate[6], beat[6], beta[6], cate[6], tace[6], beet[6], cete[6], brat[6], cart[6], batt[6], tact[6], beau[6], bura[6], rube[6], cure[6], ecru[6], burr[6], curr[6], abut[6], tabu[6], tuba[6], bute[6], tube[6], cute[6], brut[6], curt[6], butt[6], rare[4], rear[4], rate[4], tare[4], tear[4], rete[4], tree[4], tate[4], teat[4], tart[4], tret[4], urea[4], ruer[4], true[4], taut[4]

3 letter words

cab[7], ace[5], bee[5], cee[5], arb[5], bar[5], bra[5], arc[5], car[5], reb[5], rec[5], brr[5], are[3], ear[3], era[3], ere[3], ree[3]