use '?' for JOKER (blank)

From letters F, O, R, G, E, T, F, U, L, N, E, S, S, E, S  I made following words

15 letter words

forgetfulnesses[22]

13 letter words

forgetfulness[20], fretfulnesses[19]

12 letter words

resoluteness[12]

11 letter words

gruffnesses[18], greenstuffs[18], offenseless[17], fretfulness[17], restfulness[14]

10 letter words

greenstuff[17], effortless[16], freestones[13], foulnesses[13], tongueless[11], truenesses[10]

9 letter words

gruffness[16], effulgent[16], forgetful[16], forefeels[15], efferents[15], snufflers[15], effluents[15], etouffees[15], stuffless[15], songfests[13], refulgent[13], slugfests[13], freestone[12], fleetness[12], felstones[12], resoftens[12], softeners[12], frontless[12], frostless[12], fluorenes[12], fulnesses[12], resentful[12], fourteens[12], stressful[12], reglosses[10], engrosses[10], greenlets[10], estrogens[10], songsters[10], roseslugs[10], sturgeons[10], selenoses[9], entresols[9], terseness[9], resolutes[9], turnsoles[9], streusels[9], oestruses[9]

8 letter words

effulges[15], gruffest[15], forefeel[14], offenses[14], efferent[14], forefeet[14], forefelt[14], snuffler[14], snuffles[14], souffles[14], snuffers[14], effluent[14], etouffee[14], truffles[14], turnoffs[14], funfests[14], restuffs[14], stuffers[14], forelegs[12], solfeges[12], froglets[12], songfest[12], refugees[12], furlongs[12], foreguts[12], slugfest[12], foreseen[11], freeness[11], fernless[11], flensers[11], fresnels[11], foresees[11], selfness[11], flossers[11], felstone[11], resoften[11], softener[11], feetless[11], fretless[11], softness[11], fluorene[11], sneerful[11], fleurons[11], senseful[11], foulness[11], sulfones[11], fuseless[11], refluent[11], fourteen[11], outfeels[11], flouters[11], fortunes[11], foetuses[11], flusters[11], turfless[11], songless[9], egresses[9], ogresses[9], glossers[9], greenlet[9], greenest[9], estrogen[9], songster[9], grossest[9], eugenols[9], generous[9], loungers[9], rungless[9], roseslug[9], surgeons[9], guessers[9], gruntles[9], sturgeon[9], gestures[9], gustless[9], noseless[8], soleness[8], soreness[8], entresol[8], noteless[8], toneless[8], treeless[8], serenest[8], nestlers[8], solerets[8], estrones[8], stenoses[8], lostness[8], restless[8], tressels[8], selenous[8], enureses[8], neuroses[8], soleuses[8], sureness[8], sourness[8], toluenes[8], resolute[8], turnsole[8], eusteles[8], tuneless[8], unsteels[8], setulose[8], streusel[8], trueness[8], tonsures[8], estruses[8], rustless[8], unstress[8], tussores[8]

7 letter words

goffers[14], offense[13], foreleg[11], solfege[11], golfers[11], fogless[11], oneself[10], feelers[10], refeels[10], flenser[10], fresnel[10], foresee[10], feeless[10], flenses[10], enserfs[10], flosser[10], flosses[10], erelong[8], reneges[8], longers[8], geneses[8], egoless[8], glosser[8], regloss[8], engross[8], gessoes[8], glosses[8], grosses[8], serenes[7], resoles[7], senores[7], lessees[7], lessens[7], loesses[7], lessons[7], sonless[7], seeress[7]