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From letters E, C, U, M, E, N, I, C, A, L  I made following words

10 letter words

ecumenical[16]

8 letter words

leucemic[14], ecumenic[14], leucemia[12]

7 letter words

calcium[13], cenacle[11], calcine[11], licence[11], melanic[11], lucence[11], eucaine[9], cauline[9], leucine[9], alumine[9]

6 letter words

caecum[12], celiac[10], cicale[10], malice[10], cancel[10], menace[10], anemic[10], cinema[10], iceman[10], icemen[10], aecium[10], almuce[10], macule[10], acumen[10], neumic[10], mealie[8], enlace[8], inlace[8], meanie[8], enamel[8], melena[8], maline[8], menial[8], aculei[8], unciae[8], cuneal[8], lacune[8], launce[8], unlace[8], uncial[8], leucin[8], nuclei[8], alumin[8], alumni[8], lumina[8]

5 letter words

mecca[11], acmic[11], cecum[11], cecal[9], amice[9], camel[9], macle[9], claim[9], malic[9], clime[9], melic[9], amnic[9], manic[9], mince[9], umiac[9], cumin[9], mucin[9], ileac[7], email[7], maile[7], elemi[7], niece[7], clean[7], lance[7], linac[7], cline[7], enema[7], amine[7], anime[7], minae[7], leman[7], liman[7], limen[7], aulic[7], ulema[7], miaul[7], ileum[7], uncia[7], uncle[7], neume[7], lumen[7], linum[7], anele[5], alien[5], aline[5], anile[5], elain[5], liane[5], ulnae[5]

4 letter words

ceca[8], acme[8], came[8], mace[8], mica[8], emic[8], mice[8], calm[8], clam[8], culm[8], alec[6], lace[6], laic[6], ceil[6], lice[6], amie[6], alme[6], lame[6], male[6], meal[6], lima[6], mail[6], lime[6], mile[6], acne[6], cane[6], cain[6], cine[6], nice[6], clan[6], amen[6], mane[6], mean[6], name[6], nema[6], neem[6], amin[6], main[6], mina[6], mien[6], mine[6], limn[6], caul[6], clue[6], luce[6], emeu[6], alum[6], luma[6], maul[6], mule[6], unci[6], maun[6], menu[6], neum[6], muni[6], alee[4], ilea[4], elan[4], lane[4], lean[4], anil[4], lain[4], nail[4], lien[4], line[4], lieu[4], unai[4], luna[4], ulan[4], ulna[4], lune[4]

3 letter words

cam[7], mac[7], mic[7], ace[5], cee[5], ice[5], lac[5], cel[5], mae[5], eme[5], aim[5], ami[5], lam[5], elm[5], mel[5], mil[5], can[5], ale[3], lea[3], eel[3], lee[3], ail[3], lei[3], lie[3], ane[3], nae[3], nee[3], ain[3], ani[3], lin[3], nil[3]