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From letters F, O, R, E, S, T, A, L, L, M, E, N, T, S  I made following words

14 letter words

forestallments[19]

13 letter words

forestallment[18]

11 letter words

easternmost[13]

10 letter words

freemasons[15], formalness[15], forestalls[13], flatteners[13], foretastes[13], elastomers[12], salometers[12], steamrolls[12], marlstones[12], mestranols[12], allotments[12], streamlets[12], assortment[12], talentless[10]

9 letter words

forenames[14], freemason[14], flameless[14], frameless[14], fomenters[14], foremasts[14], aftermost[14], leftmosts[14], farnesols[12], fenestral[12], fellators[12], forestall[12], foretells[12], felstones[12], fasteners[12], refastens[12], seafronts[12], resoftens[12], softeners[12], frontless[12], flattener[12], fatteners[12], foretaste[12], frontlets[12], falsettos[12], melanoses[11], slalomers[11], telamones[11], lamenters[11], elastomer[11], salometer[11], martellos[11], steamroll[11], marlstone[11], mestranol[11], solemnest[11], semestral[11], steersman[11], molesters[11], monsteras[11], allotment[11], letterman[11], mantelets[11], matelotes[11], streamlet[11], statesmen[11], teamsters[11], maltsters[11], sternmost[11], alertness[9], oleasters[9], sollerets[9], earstones[9], resonates[9], entresols[9], allottees[9], tolerates[9], allotters[9], slatterns[9]

8 letter words

forename[13], enflames[13], enframes[13], fearsome[13], foramens[13], fameless[13], selfsame[13], foamless[13], formless[13], fomenter[13], raftsmen[13], ferments[13], foremast[13], formates[13], fretsome[13], formants[13], flotsams[13], refallen[11], farnesol[11], leafless[11], fellness[11], fearless[11], fernless[11], flensers[11], fresnels[11], safroles[11], fellator[11], foretell[11], fellates[11], leaflets[11], floatels[11], felstone[11], reflates[11], fastener[11], fenestra[11], refasten[11], floaters[11], forestal[11], refloats[11], seafront[11], resoften[11], softener[11], frontals[11], flatness[11], loftless[11], feasters[11], fretless[11], slalomer[10], morelles[10], almoners[10], solemner[10], mealless[10], lameness[10], maleness[10], maneless[10], nameless[10], salesmen[10], loamless[10], anemoses[10], smellers[10], moreness[10], normless[10], lamenter[10], martello[10], talesmen[10], tramells[10], molester[10], monstera[10], onstream[10], tonearms[10], mateless[10], meatless[10], tameless[10], smallest[10], tameness[10], maltoses[10], masseter[10], seamster[10], steamers[10], lamsters[10], tramless[10], resmelts[10], smelters[10], termless[10], sarments[10], smartens[10], maestros[10], somerset[10], rellenos[8], enolases[8], realness[8], roselles[8], reseason[8], seasoner[8], eternals[8], telerans[8], oleaster[8], reallots[8], rostella[8], solleret[8], earstone[8], resonate[8], entresol[8], lateness[8], tallness[8], snellest[8], noteless[8], toneless[8], stollens[8], reslates[8], stealers[8], tearless[8], assenter[8], earnests[8], sarsenet[8], salterns[8], nestlers[8], olestras[8], solerets[8], allsorts[8], assentor[8], santeros[8], senators[8], starnose[8]