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

15 letter words

feloniousnesses[18]

13 letter words

feloniousness[16]

12 letter words

sinfulnesses[15]

11 letter words

looninesses[11], loosenesses[11], lousinesses[11]

10 letter words

finenesses[13], selfnesses[13], sinfulness[13], foulnesses[13], lonenesses[10], solenesses[10], nosinesses[10]

9 letter words

nonfossil[12], felonious[12], fulnesses[12], fussiness[12], looniness[9], selenoses[9], lionesses[9], noiseless[9], selenosis[9], onenesses[9], looseness[9], senseless[9], selenious[9], unloosens[9], lousiness[9], nonissues[9], issueless[9]

8 letter words

felonies[11], olefines[11], fineness[11], floosies[11], finesses[11], selfness[11], flossies[11], senseful[11], foulness[11], sulfones[11], fuseless[11], loneness[8], enosises[8], noesises[8], noseless[8], soleness[8], nosiness[8], sessions[8], unloosen[8], selenous[8], elusions[8], nonissue[8], unsonsie[8], nounless[8], unlooses[8], soleuses[8]

7 letter words

olefine[10], nonlife[10], felines[10], fennels[10], oneself[10], olefins[10], nonself[10], floosie[10], foliose[10], feeless[10], finesse[10], flenses[10], finless[10], flossie[10], foisons[10], flosses[10], fossils[10], nonfuel[10], funnies[10], funnels[10], sulfone[10], folious[10], infuses[10], fulness[10], fusions[10], leonine[7], oleines[7], loonies[7], ionones[7], enisles[7], ensiles[7], seniles[7], innless[7], eosines[7], insoles[7], lesions[7], lioness[7], oneness[7], sonnies[7], nelsons[7], loosens[7], solions[7], lessees[7], sessile[7], senseis[7], lessens[7], sinless[7], loesses[7], essoins[7], osseins[7], session[7], lessons[7], sonless[7], elusion[7], unloose[7], ileuses[7], silenus[7], ensouls[7], insouls[7], nonuses[7], unisons[7], useless[7], sinuses[7], sunless[7], osseous[7]

6 letter words

feline[9], fennel[9], olefin[9], flooie[9], flense[9], elfins[9], filose[9], felons[9], folios[9], foison[9], fossil[9], fesses[9], fosses[9], funnel[9], fusile[9], infuse[9], sinful[9], fusion[9], fusees[9], fusels[9], fusils[9], fusses[9], oleine[6], online[6], loonie[6], ionone[6], enisle[6], ensile[6], senile[6], linens[6], eosine[6], leones[6], eloins[6], insole[6], lesion[6], oleins[6], nelson[6], looies[6], loosen[6], solion[6], onions[6], lessee[6], seines[6], sensei[6], lenses[6], lessen[6], enosis[6], eosins[6], essoin[6], noesis[6], noises[6], ossein[6], sonsie[6], lesson[6], looses[6], nooses[6], snools[6], solons[6], seises[6], nesses[6], senses[6], losses[6], sisses[6], lunies[6], unseen[6], ennuis[6], louies[6], ensoul[6], insoul[6], nonuse[6], unions[6], unison[6], ensues[6], unless[6], louses[6], ousels[6], soleus[6], nouses[6], onuses[6]