use '?' for JOKER (blank)

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

15 letter words

frightfulnesses[25]

14 letter words

rightfulnesses[21]

13 letter words

frightfulness[23]

12 letter words

rightfulness[19], fitfulnesses[18]

11 letter words

reshuffling[21], huffinesses[20], gruffnesses[18], greenstuffs[18], fretfulness[17], lightnesses[15], rightnesses[15], hirsuteness[14], restfulness[14]

10 letter words

reshuffles[19], surffishes[19], lungfishes[17], sufferings[17], greenstuff[17], restuffing[17], fleshiness[16], stiffeners[16], fitfulness[16], snuffliest[16], stuffiness[16], reshingles[14], lighteners[14], sheltering[14], slightness[14], sightseers[14], flustering[14], strifeless[13], futileness[13], interfuses[13], huntresses[13], trignesses[11], stringless[11], gluinesses[11], uglinesses[11], russetings[11], sultriness[10]

9 letter words

shuffling[19], frightful[19], reshuffle[18], huffiness[18], shufflers[18], fleshings[16], frightens[16], suffering[16], gruffness[16], effulgent[16], gruffiest[16], stuffings[16], snifflers[15], freshness[15], theirself[15], stiffener[15], fleshiest[15], heftiness[15], shiftless[15], stiffness[15], snufflier[15], unselfish[15], siffleurs[15], furnishes[15], snufflers[15], sunfishes[15], flushness[15], effluents[15], ruffliest[15], strifeful[15], snuffiest[15], stuffless[15], reshingle[13], englishes[13], sleighers[13], shinglers[13], telfering[13], lengthier[13], lightener[13], festering[13], sheetings[13], sightseen[13], lightness[13], nightless[13], sightseer[13], slighters[13], rightness[13], sightsees[13], sightless[13], refueling[13], gushiness[13], refulgent[13], sleuthing[13], theurgies[13], hungriest[13], sunlights[13], slugfests[13], litheness[12], infesters[12], fitnesses[12], shirtless[12], firstness[12], fusileers[12], reinfuses[12], fulnesses[12], unfertile[12], interfuse[12], resentful[12], tusheries[12], fruitless[12], slushiest[12], fustiness[12], stressful[12], ingresses[10], streeling[10], sterlings[10], stingless[10], tigresses[10], stressing[10], seigneurs[10], genitures[10], lustering[10], resulting[10], eugenists[10], russeting[10], lustrings[10], gustiness[10], gutsiness[10], trussings[10], enlisters[9], listeners[9], reenlists[9], surliness[9], unsterile[9], insulters[9], lustiness[9], streusels[9], rustiness[9]

8 letter words

sheriffs[17], fleshing[15], freshing[15], frighten[15], fighters[15], freights[15], refights[15], fleshier[14], sniffler[14], sniffles[14], fleshers[14], freshens[14], sniffers[14], fishless[14], fifteens[14], fleering[12], feelings[12], heelings[12], sleigher[12], feigners[12], greenish[12], rehinges[12], sheering[12], flingers[12], shingler[12], shingles[12], sighless[12], fleeting[12], seething[12], sheeting[12], feltings[12], lightens[12], lighters[12], relights[12], slighter[12], greenths[12], fireless[11], heirless[11], relishes[11], rifeness[11], reshines[11], fernless[11], flensers[11], fresnels[11], finesses[11], selfness[11], theelins[11], ferniest[11], infester[11], reelings[9], greisens[9], slingers[9], gneisses[9], greenlit[9], gentiles[9], sleeting[9], steeling[9], gentries[9], integers[9], reesting[9], reinless[8]