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From letters E, C, O, F, E, M, I, N, I, S, T  I made following words

11 letter words

ecofeminist[18]

9 letter words

centesimi[13], semeiotic[13], centesimo[13], semitonic[13]

8 letter words

comfiest[15], feminise[13], feminist[13], fictions[13], centimes[12], tenesmic[12], minciest[12], comities[12], semiotic[12], centimos[12], monistic[12], nomistic[12], notifies[11], niceties[10], enmities[10], moieties[10], seicento[10], monetise[10], semitone[10]

7 letter words

omnific[14], motific[14], comfits[14], feminie[12], fiction[12], semifit[12], infects[12], fomites[12], confits[12], foments[12], miocene[11], menisci[11], incomes[11], mesonic[11], miscoin[11], centime[11], meiotic[11], centimo[11], tonemic[11], emetics[11], miscite[11], cements[11], miotics[11], somitic[11], finites[10], nifties[10], meinies[9], senecio[9], eosinic[9], nicoise[9], onetime[9], itemise[9], entices[9], incites[9], emetins[9], coesite[9], cenotes[9], notices[9], section[9], tonemes[9], mestino[9], moisten[9], sentimo[9], sienite[7], inosite[7]

6 letter words

comfit[13], foemen[11], fences[11], ficins[11], ficoes[11], infect[11], fomite[11], confit[11], foment[11], fistic[11], misfit[11], motifs[11], icemen[10], income[10], minces[10], socmen[10], emetic[10], cement[10], miotic[10], comets[10], comtes[10], sitcom[10], finite[9], finito[9], feints[9], finest[9], infest[9], softie[9], soften[9], meinie[8], nieces[8], incise[8], imines[8], conies[8], cosine[8], icones[8], oscine[8], ionics[8], eonism[8], monies[8], entice[8], incite[8], emetin[8], intime[8], cenote[8], noetic[8], notice[8], toneme[8], cities[8], iciest[8], incest[8], insect[8], nicest[8], cestoi[8], emotes[8], somite[8], centos[8], contes[8], tocsin[8], tonics[8], montes[8], inmost[8], monist[8], eosine[6], ionise[6], seniti[6]

5 letter words

fence[10], ficin[10], feces[10], fices[10], femes[10], coifs[10], motif[10], mince[9], mesic[9], comes[9], osmic[9], comet[9], comte[9], fines[8], neifs[8], finis[8], finos[8], foins[8], infos[8], feint[8], often[8], fetes[8], feist[8], niece[7], imine[7], ionic[7], monie[7], imino[7], cense[7], scene[7], cines[7], since[7], mense[7], mesne[7], neems[7], semen[7], miens[7], mines[7], minis[7], cosie[7], cones[7], scone[7], cions[7], coins[7], icons[7], scion[7], sonic[7], meson[7], nomes[7], omens[7], emote[7], cento[7], conte[7], oncet[7], ontic[7], tonic[7], monte[7], cetes[7], cesti[7], cites[7], meets[7], seine[5], nisei[5], eosin[5], noise[5]