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From letters D, E, F, O, L, I, A, T, E  I made following words

9 letter words

defoliate[13]

8 letter words

foliated[12]

7 letter words

deflate[11], fileted[11], floated[11], feedlot[11], foliate[10]

6 letter words

deflea[10], leafed[10], afield[10], failed[10], defile[10], foaled[10], loafed[10], foiled[10], defeat[10], felted[10], flited[10], lifted[10], foetid[10], lofted[10], fetial[9], foetal[9], folate[9], aedile[7], elodea[7], eidola[7], ideate[7], delate[7], elated[7], detail[7], dilate[7], tailed[7], iodate[7], toiled[7], oleate[6], etoile[6]

5 letter words

felid[9], field[9], filed[9], flied[9], defat[9], fated[9], feted[9], fetid[9], delft[9], folia[8], fetal[8], fleet[8], filet[8], flite[8], aloft[8], float[8], flota[8], ailed[6], ideal[6], edile[6], elide[6], oiled[6], oldie[6], dealt[6], delta[6], lated[6], tidal[6], tilde[6], tiled[6], dotal[6], toled[6], elate[5], telae[5], telia[5], elite[5], teloi[5], toile[5]

4 letter words

deaf[8], fade[8], feed[8], defi[8], delf[8], fled[8], fado[8], feod[8], fido[8], fold[8], daft[8], deft[8], alef[7], feal[7], flea[7], leaf[7], feel[7], flee[7], alif[7], fail[7], fila[7], file[7], lief[7], life[7], foal[7], loaf[7], floe[7], filo[7], foil[7], fate[7], feat[7], feta[7], feet[7], fete[7], fiat[7], flat[7], felt[7], left[7], flit[7], lift[7], loft[7], aide[5], idea[5], eide[5], dale[5], deal[5], lade[5], lead[5], dele[5], dial[5], laid[5], deil[5], deli[5], diel[5], idle[5], lied[5], odea[5], load[5], dole[5], lode[5], diol[5], idol[5], lido[5], loid[5], date[5], deet[5], teed[5], adit[5], dita[5], diet[5], dite[5], edit[5], tide[5], tied[5], delt[5], dato[5], doat[5], toad[5], dote[5], toed[5], doit[5], dolt[5], told[5], alee[4], ilea[4], aloe[4], olea[4], late[4], tael[4], tale[4], teal[4], tela[4], leet[4], teel[4], tele[4], alit[4], lati[4], tail[4], tali[4], lite[4], tile[4], toea[4], iota[4], alto[4], lota[4], tola[4], tole[4], loti[4], toil[4]

3 letter words

fad[7], def[7], fed[7], dif[7], fid[7], fee[6], fie[6], dee[4], aid[4], die[4], dal[4], lad[4], del[4], eld[4], led[4], ale[3], lea[3]