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

11 letter words

easternmost[13]

10 letter words

assortment[12]

9 letter words

steersman[11], monsteras[11], statesmen[11], teamsters[11], sternmost[11], earstones[9], resonates[9]

8 letter words

anemoses[10], moreness[10], monstera[10], onstream[10], tonearms[10], tameness[10], masseter[10], seamster[10], steamers[10], sarments[10], smartens[10], maestros[10], somerset[10], transoms[10], monsters[10], teamster[10], remotest[10], torments[10], stomates[10], mattress[10], smartest[10], smatters[10], reseason[8], seasoner[8], earstone[8], resonate[8], assenter[8], earnests[8], sarsenet[8], assentor[8], santeros[8], senators[8], starnose[8], treasons[8], estrones[8], entreats[8], ratteens[8], estreats[8], restates[8], retastes[8], tartness[8], sternest[8], toasters[8], rosettes[8], stentors[8]

7 letter words

meaners[9], renames[9], enamors[9], moaners[9], oarsmen[9], moreens[9], seamers[9], ramsons[9], ransoms[9], sermons[9], tonearm[9], meanest[9], tonemes[9], remates[9], reteams[9], steamer[9], martens[9], sarment[9], smarten[9], maestro[9], emoters[9], meteors[9], remotes[9], matrons[9], transom[9], mentors[9], monster[9], stamens[9], mesteso[9], stemson[9], masters[9], streams[9], tomenta[9], torment[9], metates[9], stomate[9], matters[9], smatter[9], mostest[9], arenose[7], serosae[7], reasons[7], senoras[7], senores[7], earnest[7], eastern[7], nearest[7], roseate[7], atoners[7], santero[7], senator[7], treason[7], estrone[7], entases[7], sateens[7], senates[7], sensate[7], easters[7], reseats[7], searest[7], seaters[7], teasers[7], tessera[7], sarsnet[7], nesters[7], renests[7], resents[7], osetras[7], ossetra[7], stereos[7], nestors[7], stoners[7], tensors[7], entreat[7], ratteen[7], ternate[7], neatest[7], notates[7], estreat[7], restate[7], retaste[7], natters[7], rattens[7], netters[7], tenters[7], rotates[7], toaster[7], rosette[7], attorns[7], rattons[7], stentor[7], estates[7], tensest[7], stetson[7], testons[7], starets[7], staters[7], tasters[7], retests[7], setters[7], streets[7], tersest[7], testers[7], stators[7]

6 letter words

meaner[8], rename[8], enamor[8], moaner[8], moreen[8], enemas[8], mensae[8], seamen[8], ameers[8], ramees[8], seamer[8], namers[8], remans[8], ramose[8], manors[8], ramson[8], ransom[8], romans[8], sermon[8], sesame[8], manses[8], mensas[8], messan[8], menses[8], mesnes[8], semens[8], masons[8], somans[8], mesons[8], marses[8], masers[8], smears[8], arenes[6], ranees[6], arseno[6], reason[6], senora[6], season[6], erases[6], sarees[6], sarsen[6], snares[6]