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From letters Y, E, L, L, O, W, T, A, I, L  I made following words

10 letter words

yellowtail[16]

7 letter words

lowlily[13], tallowy[13], tollway[13]

6 letter words

oilway[12], yellow[12], wallie[9], wallet[9], willet[9], tallow[9], leally[9], lately[9], lealty[9], aliyot[9], taille[6], telial[6], tallol[6]

5 letter words

wally[11], welly[11], willy[11], yowie[11], lowly[11], wetly[11], allow[8], tawie[8], twill[8], towie[8], owlet[8], towel[8], alley[8], allyl[8], alloy[8], loyal[8], lolly[8], laity[8], tally[8], telly[8], tolyl[8], ileal[5], telia[5], teloi[5], toile[5], allot[5], atoll[5]

4 letter words

waly[10], yawl[10], wyle[10], wily[10], yowe[10], yowl[10], wyte[10], towy[10], wale[7], weal[7], wail[7], lwei[7], wile[7], wall[7], well[7], will[7], alow[7], awol[7], lowe[7], twae[7], wait[7], wite[7], welt[7], wilt[7], ally[7], yell[7], illy[7], lily[7], yill[7], oily[7], yeti[7], ilea[4], leal[4], lall[4], aloe[4], olea[4], olla[4], lilo[4], loll[4], late[4], tael[4], tale[4], teal[4], tela[4], alit[4], lati[4], tail[4], tali[4], lite[4], tile[4], tall[4], tell[4], lilt[4], till[4], toea[4], iota[4], alto[4], lota[4], tola[4], tole[4], loti[4], toil[4], toll[4]

3 letter words

way[9], yaw[9], wye[9], yew[9], yow[9], awe[6], wae[6], awl[6], law[6], owe[6], woe[6], low[6], owl[6], taw[6], twa[6], wat[6], tew[6], wet[6], wit[6], tow[6], two[6], wot[6], aye[6], yea[6], lay[6], ley[6], lye[6], tye[6], yet[6], toy[6], ale[3], lea[3], ail[3], lei[3], lie[3], all[3], ell[3], ill[3], ole[3], oil[3], ate[3], eat[3], eta[3], tae[3], tea[3], ait[3], tie[3], alt[3], lat[3], let[3], tel[3], lit[3], til[3], oat[3], tao[3], toe[3], lot[3]

2 letter words

aw[5], we[5], ow[5], wo[5], ay[5], ya[5], ye[5], oy[5], yo[5], ae[2], ai[2], al[2], la[2], el[2], li[2], oe[2], oi[2], lo[2], at[2], ta[2], et[2], it[2], ti[2], to[2]