use '?' for JOKER (blank)

From letters K, A, F, F, E, E, K, L, A, T, S, C, H  I made following words

13 letter words

kaffeeklatsch[32]

9 letter words

falseface[17], leachates[14]

8 letter words

klatches[17], fletches[16], alkahest[15], teacakes[14], leachate[13], alcahest[13], chelates[13], escalate[10]

7 letter words

keckles[17], ashcake[16], hackees[16], hackles[16], shackle[16], heckles[16], haffets[16], ketches[16], klatsch[16], effaces[15], fleches[15], affects[15], effects[15], fetches[15], takahes[14], flasket[14], teacake[13], tackles[13], leaches[12], chaetae[12], falcate[12], chaetal[12], chelate[12], escheat[12], teaches[12], chalets[12], latches[12], satchel[12], letches[12], altheas[10], caseate[9], acetals[9], lactase[9], celesta[9]

6 letter words

chaffs[17], keckle[16], hackee[15], hackle[15], heckle[15], haceks[15], cheeks[15], flacks[15], flecks[15], chalks[15], haffet[15], klatch[15], thacks[15], sketch[15], efface[14], fleche[14], fleech[14], chafes[14], sclaff[14], affect[14], effect[14], fletch[14], flakes[13], shekel[13], takahe[13], ackees[12], cleeks[12], tackle[12], casket[12], faecal[11], chelae[11], faeces[11], falces[11], calash[11], chelas[11], laches[11], leches[11], facete[11], chaeta[11], thecae[11], chalet[11], thecal[11], facets[11], chaste[11], cheats[11], sachet[11], scathe[11], taches[11], etches[11], clefts[11], slatch[11], akelas[10], latkes[10], althea[9], festal[9], fleets[9], halest[9], haslet[9], lathes[9], shelta[9], lethes[9], calesa[8], acetal[8], castle[8], cleats[8], eclats[8], elects[8], select[8], alates[6], elates[6], stelae[6], teasel[6]

5 letter words

chaff[16], khafs[15], kecks[15], hacek[14], cheek[14], flack[14], fleck[14], chalk[14], fecks[14], hacks[14], shack[14], hecks[14], chafe[13], caffs[13], chefs[13], kakas[13], keeks[13], flake[12], fakes[12], keefs[12], kasha[12], hakes[12], shake[12], flask[12], lakhs[12], ackee[11], alack[11], cleek[11], haafs[11], sheaf[11], cakes[11], flash[11], flesh[11], shelf[11], calks[11], lacks[11], slack[11], fecal[10], chela[10], leach[10], leech[10], cafes[10], faces[10], feces[10], aches[10], chase[10], eches[10], calfs[10], clefs[10], clash[10], facet[10], cheat[10], akela[9], akees[9], kales[9], lakes[9], leaks[9], slake[9], keels[9], leeks[9], sleek[9], fease[8], alfas[8], alefs[8], false[8], fleas[8], leafs[8], feels[8], flees[8], hales[8], heals[8], leash[8], selah[8], shale[8], sheal[8], heels[8], cease[7], alecs[7], laces[7], scale[7], aceta[7], easel[5], lease[5]