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

15 letter words

frivolousnesses[21]

13 letter words

frivolousness[19]

11 letter words

lousinesses[11], surlinesses[11], seriousness[11]

10 letter words

solferinos[13], foulnesses[13], revulsions[13], overissues[13], oleoresins[10], rosinesses[10], sournesses[10]

9 letter words

overflies[15], oviferous[15], frivolous[15], felonries[12], fooleries[12], rooflines[12], solferino[12], felonious[12], fluorenes[12], fluorines[12], fusileers[12], reinfuses[12], fluoroses[12], fluorosis[12], fulnesses[12], fussiness[12], novelises[12], snivelers[12], eversions[12], visorless[12], revulsion[12], evulsions[12], universes[12], overissue[12], ourselves[12], souvenirs[12], oversouls[12], voussoirs[12], oleoresin[9], looseners[9], lionesses[9], noiseless[9], selenosis[9], looseness[9], sorosises[9], selenious[9], lousiness[9], surliness[9], issueless[9]

8 letter words

foveoles[14], overfoul[14], feverous[14], roofline[11], felonies[11], olefines[11], floosies[11], fireless[11], rifeness[11], fernless[11], flensers[11], fresnels[11], flossier[11], roofless[11], finesses[11], selfness[11], flossies[11], flossers[11], frissons[11], fluorene[11], fluorine[11], fusileer[11], reinfuse[11], sneerful[11], fleurons[11], fluorins[11], senseful[11], foulness[11], sulfones[11], infusers[11], sunroofs[11], fuseless[11], fissures[11], novelise[11], violones[11], liveners[11], sniveler[11], overlies[11], relievos[11], voleries[11], eversion[11], evilness[11], liveness[11], veinless[11], vileness[11], inverses[11], versines[11], resolves[11], versions[11], veinules[11], venulose[11], evulsion[11], universe[11], nervules[11], rivulose[11], souvenir[11], oversoul[11], surveils[11], overuses[11], voussoir[11], eloiners[8], loosener[8], reinless[8], erosions[8], rosinols[8], enosises[8], noesises[8], noseless[8], soleness[8], rissoles[8], soreness[8], rosiness[8], sessions[8], selenous[8], elusions[8], unlooses[8], leisures[8], enuresis[8], soilures[8], neuroses[8], neurosis[8], resinous[8], rosinous[8], soleuses[8], reissues[8], seisures[8], sureness[8], sunrises[8], sourness[8]

7 letter words

olefine[10], felines[10], oneself[10], olefins[10], floosie[10], foliose[10], ferlies[10], refiles[10], reflies[10], reliefs[10], refines[10], flenser[10], fresnel[10], florins[10], roofies[10], finesse[10], flenses[10], finless[10], flossie[10], foisons[10], frisees[10], enserfs[10], flosser[10], frisson[10], eloiner[7], loonier[7], oleines[7], loonies[7], liernes[7], relines[7], nerolis[7], orioles[7], erosion[7], rosinol[7], enisles[7], ensiles[7], seniles[7], eosines[7], insoles[7], lesions[7], lioness[7], loosens[7], solions[7], ireless[7], resiles[7], seiners[7], sereins[7], serines[7], soirees[7], resoles[7], lorises[7], rissole[7], senores[7], seniors[7], sonsier[7], noosers[7], sooners[7], orisons[7], sessile[7], senseis[7]