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From letters F, I, S, S, I, P, A, R, O, U, S, N, E, S, S  I made following words

15 letter words

fissiparousness[20]

12 letter words

prussianises[14]

11 letter words

saponifiers[16], fissiparous[16], prussianise[13], persuasions[13]

10 letter words

saponifier[15], saponifies[15], perfusions[15], aspersions[12], prissiness[12], persuasion[12], suspensors[12]

9 letter words

pinafores[14], perfusion[14], superfans[14], sanserifs[12], ossifiers[12], nefarious[12], furanoses[12], russifies[12], fussiness[12], aspersion[11], soapiness[11], raspiness[11], psoriases[11], psoriasis[11], prosiness[11], piousness[11], pursiness[11], suspensor[11], surpasses[11], sassiness[9], sissiness[9], assessors[9], arsenious[9], ossuaries[9]

8 letter words

pinafore[13], firepans[13], panfries[13], profanes[13], purifies[13], superfan[13], farinose[11], fairness[11], sanserif[11], ossifier[11], ossifies[11], fissions[11], frissons[11], unifiers[11], furanose[11], infusers[11], fissures[11], ripienos[10], senopias[10], sinopias[10], aspirins[10], inspires[10], personas[10], responsa[10], ropiness[10], passions[10], isospins[10], prissies[10], prossies[10], pissoirs[10], pruinose[10], upraises[10], poussies[10], suspires[10], passuses[10], airiness[8], erasions[8], sensoria[8], rosiness[8], sessions[8], assessor[8], anuresis[8], senarius[8], anserous[8], arsenous[8], neurosis[8], resinous[8], suasions[8], sunrises[8], sourness[8]

7 letter words

firepan[12], profane[12], profess[12], profuse[12], fairies[10], infares[10], insofar[10], finises[10], fission[10], fraises[10], farness[10], frisson[10], frasses[10], unifier[10], unifies[10], furanes[10], infuser[10], fusains[10], infuses[10], fusions[10], fissure[10], fussier[10], epinaoi[9], ripieno[9], epinaos[9], senopia[9], sinopia[9], sinopie[9], paniers[9], rapines[9], aspirin[9], inspire[9], spinier[9], soapier[9], persona[9], soprani[9], orpines[9], pansies[9], sapiens[9], passion[9], spinose[9], isospin[9], aspires[9], paresis[9], parises[9], praises[9], spireas[9], sprains[9], snipers[9], soapers[9], poisers[9], prossie[9], pissoir[9], parsons[9], persons[9], prisons[9], spinors[9], asepsis[9], aspises[9], passers[9], pissers[9], prisses[9], prosses[9], possess[9], upraise[9], purines[9], uprisen[9], soupier[9], inpours[9], puisnes[9], supines[9], poussie[9], spinous[9], pausers[9], pussier[9], suspire[9], uprises[9], senarii[7], erasion[7], ironies[7], noisier[7], ionises[7], arsines[7], raisins[7], reasons[7], senoras[7], seniors[7], sonsier[7], sanseis[7], seisins[7], seasons[7], essoins[7], osseins[7], session[7], sassier[7], sissier[7], sarsens[7], saroses[7], serosas[7], seisors[7], sensors[7], sassies[7], sissies[7], arenous[7], urinose[7], sanious[7], suasion[7], sauries[7], insures[7], sunrise[7], arouses[7], souaris[7], serious[7]