use '?' for JOKER (blank)

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

15 letter words

fruitlessnesses[18]

13 letter words

restfulnesses[16], fruitlessness[16]

12 letter words

futilenesses[15], tirelessness[12], restlessness[12], sultrinesses[12]

11 letter words

fertileness[14], firstnesses[14], fussinesses[14], restfulness[14], fustinesses[14], surlinesses[11], uselessness[11], lustinesses[11], rustinesses[11]

10 letter words

rifenesses[13], selfnesses[13], strifeless[13], futileness[13], interfuses[13], litenesses[10], steeliness[10], resistless[10], stressless[10], enuresises[10], surenesses[10], truenesses[10], sultriness[10], unstresses[10]

9 letter words

fleetness[12], infesters[12], fitnesses[12], firstness[12], fusileers[12], reinfuses[12], fulnesses[12], fussiness[12], unfertile[12], interfuse[12], resentful[12], fruitless[12], fustiness[12], stressful[12], leeriness[9], senseless[9], enlistees[9], selenites[9], eternises[9], sneeriest[9], enlisters[9], listeners[9], reenlists[9], terseness[9], surliness[9], issueless[9], unsterile[9], insulters[9], lustiness[9], streusels[9], rustiness[9]

8 letter words

fireless[11], freeness[11], rifeness[11], fernless[11], flensers[11], fresnels[11], finesses[11], selfness[11], reefiest[11], ferniest[11], infester[11], feetless[11], felsites[11], fretless[11], riftless[11], stiflers[11], snifters[11], fusileer[11], reinfuse[11], sneerful[11], senseful[11], infusers[11], fuseless[11], fissures[11], refluent[11], sulfites[11], surfeits[11], surfiest[11], flusters[11], turfless[11], fussiest[11], eeriness[8], eserines[8], reinless[8], enlistee[8], selenite[8], leeriest[8], sleetier[8], steelier[8], eternise[8], teensier[8], enlister[8], listener[8], reenlist[8], silenter[8], steelies[8], liteness[8], setlines[8], treeless[8], leisters[8], tireless[8], serenest[8], sentries[8], nestlers[8], sestines[8], restless[8], tressels[8], stresses[8], leisures[8], enureses[8], enuresis[8], reissues[8], seisures[8], sureness[8], sunrises[8], esurient[8], retinues[8], reunites[8], insulter[8], eusteles[8], tuneless[8], unsteels[8], utensils[8], sureties[8], streusel[8], surliest[8], trueness[8], estruses[8], rustless[8], unstress[8], tussises[8]

7 letter words

felines[10], feelers[10], refeels[10], ferlies[10], refiles[10], reflies[10], reliefs[10], refines[10], flenser[10], fresnel[10], feeless[10], finesse[10], flenses[10], finless[10], frisees[10], enserfs[10], fleeter[10], fertile[10], felsite[10], lefties[10], liefest[10], reflets[10], telfers[10], filters[10], lifters[10], stifler[10], trifles[10], eserine[7], liernes[7], relines[7], enisles[7], ensiles[7], seniles[7], ireless[7], resiles[7], serenes[7], seiners[7], sereins[7], serines[7], lessees[7], sessile[7], senseis[7], lessens[7], sinless[7], seeress[7], seisers[7], teenier[7], eeliest[7], steelie[7], stelene[7], lenites[7], lisente[7], setline[7], tensile[7], eeriest[7], leister[7], retiles[7], sterile[7]