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

15 letter words

faultlessnesses[18]

13 letter words

faultlessness[16]

12 letter words

selflessness[15]

11 letter words

falsenesses[14], stalenesses[11], uselessness[11], sultanesses[11]

10 letter words

fellnesses[13], safenesses[13], selfnesses[13], flatnesses[13], fastnesses[13], fullnesses[13], latenesses[10], tallnesses[10], saltnesses[10], entelluses[10]

9 letter words

falseness[12], fleetness[12], feastless[12], fatnesses[12], fulnesses[12], faultless[12], senseless[9], selenates[9], staleness[9], assetless[9], sullenest[9], sultaness[9]

8 letter words

leafless[11], fellness[11], selfless[11], safeness[11], selfness[11], fellates[11], leaflets[11], feetless[11], flatness[11], fastness[11], senseful[11], fullness[11], fuseless[11], flatuses[11], sulfates[11], lensless[8], assesses[8], selenate[8], lateness[8], tallness[8], snellest[8], seatless[8], saltless[8], sensates[8], saltness[8], entellus[8], eusteles[8], tuneless[8], unsteels[8]

7 letter words

feeless[10], flenses[10], fellate[10], leaflet[10], fellest[10], falsest[10], fatless[10], fastens[10], fatness[10], easeful[10], fulness[10], teenful[10], sulfate[10], fullest[10], flaunts[10], fetuses[10], sunfast[10], lessees[7], lessens[7], lateens[7], leanest[7], stelene[7], teasels[7], teleses[7], sallets[7], stellas[7], entases[7], sateens[7], senates[7], sensate[7], nestles[7], netless[7], tassels[7], assents[7], uneases[7], sensual[7], unseals[7], unsells[7], useless[7], sunless[7], eluates[7], eustele[7], eluants[7], eluents[7], unsteel[7], salutes[7], taluses[7], unseats[7], sultans[7], tussles[7], sunsets[7]

6 letter words

fallen[9], fellas[9], flanes[9], flense[9], feases[9], fesses[9], festal[9], fleets[9], fasten[9], feasts[9], safest[9], unsafe[9], fusees[9], sulfas[9], fusels[9], snafus[9], fusses[9], flaunt[9], fluent[9], unfelt[9], faults[9], flatus[9], flutes[9], funest[9], allees[6], aneles[6], easels[6], leases[6], lessee[6], selles[6], lenses[6], lessen[6], snells[6], lasses[6], nesses[6], senses[6], assess[6], sasses[6], lateen[6], elates[6], stelae[6], teasel[6], sallet[6], stella[6], enates[6], sateen[6], senate[6], latens[6], nestle[6], teases[6], leasts[6], slates[6], stales[6], steals[6], tassel[6], teslas[6], sleets[6], steels[6], steles[6], stalls[6], assent[6], sanest[6], stanes[6], tenses[6], slants[6], assets[6], stases[6], tasses[6], aeneus[6], unease[6], unseal[6], sullen[6], unsell[6], anuses[6], usneas[6], ensues[6], unless[6], susses[6], eluate[6], luteal[6], eluant[6], lunate[6], eluent[6], salute[6], elutes[6], tulles[6], unseat[6], tenues[6], sultan[6], lunets[6], sautes[6]