use '?' for JOKER (blank)

From letters F, A, T, H, E, A, D, E, D, N, E, S, S, E, S  I made following words

15 letter words

fatheadednesses[23]

13 letter words

fatheadedness[21]

11 letter words

fadednesses[16], datednesses[13]

10 letter words

handfasted[18], headstands[15], deafnesses[14], daftnesses[14], deftnesses[14], deadnesses[12], sedateness[11]

9 letter words

fatheaded[17], handfasts[16], fadedness[14], headstand[14], fatnesses[12], datedness[11]

8 letter words

fatheads[15], sheetfed[15], handfast[15], deafened[13], defensed[13], headends[13], defeated[13], deafness[12], defenses[12], dasheens[12], endashes[12], fastened[12], hastened[12], headsets[12], daftness[12], deftness[12], handsets[12], safeness[11], sneeshes[11], antheses[11], estheses[11], fastness[11], deadness[10], assented[9], sensated[9], standees[9], sensates[8]

7 letter words

sheafed[14], fathead[14], shafted[14], headend[12], deashed[12], defends[12], haddest[12], deafens[11], defense[11], dasheen[11], sheened[11], deashes[11], deafest[11], defeats[11], feasted[11], headset[11], seethed[11], sheeted[11], handset[11], stashed[11], snashes[10], ethanes[10], ethenes[10], seethes[10], fastens[10], fatness[10], hastens[10], snathes[10], stashes[10], deadens[9], desands[9], saddens[9], deadest[9], sedated[9], steaded[9], saddest[9], sadness[8], ansated[8], standee[8], sedates[8], densest[8], entases[7], sateens[7], senates[7], sensate[7], assents[7]

6 letter words

fashed[13], hafted[13], hefted[13], fashes[12], sheafs[12], shafts[12], headed[11], heeded[11], defend[11], fended[11], handed[11], dashed[11], shaded[11], deafen[10], feased[10], endash[10], fessed[10], dashes[10], sadhes[10], sashed[10], shades[10], shends[10], defeat[10], heated[10], hanted[10], hented[10], defats[10], fasted[10], deaths[10], hasted[10], faenas[9], feases[9], hansas[9], hanses[9], sheens[9], sneesh[9], fesses[9], sashes[9], ethane[9], ethene[9], seethe[9], fasten[9], hasten[9], snathe[9], thanes[9], feasts[9], safest[9], hastes[9], sheets[9], theses[9], snaths[9], deaden[8], deaned[8], needed[8], seeded[8], dedans[8], desand[8], sadden[8], sanded[8], sended[8], dented[8], tended[8], sedans[7], sensed[7], sassed[7], adnate[7], anteed[7], seated[7], sedate[7], teased[7], staned[7], nested[7], tensed[7], stades[7], steads[7], tsades[7], steeds[7], stands[7], nesses[6], senses[6], ansate[6], enates[6], sateen[6], senate[6], teases[6], assent[6], sanest[6], stanes[6], tenses[6], assets[6], stases[6], tasses[6]

5 letter words

faded[10], haded[10], aahed[9], ahead[9], fades[9], feeds[9], ashed[9], deash[9], hades[9], heads[9], faena[8], fease[8], ended[7], dadas[7], deads[7], deeds[7], aedes[6], eased[6]