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

11 letter words

yellowtails[17]

10 letter words

yellowtail[16]

9 letter words

loyalties[12]

8 letter words

sallowly[14], sweatily[14], tollways[14], lowliest[11], loyalest[11], loyalist[11]

7 letter words

lowlily[13], oilways[13], sallowy[13], yellows[13], tallowy[13], tollway[13], wallies[10], wallets[10], willets[10], tallows[10], stalely[10], saltily[10], lollies[7], tailles[7], tallies[7], isolate[7], tallols[7]

6 letter words

oilway[12], yellow[12], wisely[12], yowies[12], slowly[12], sweaty[12], wallie[9], walies[9], allows[9], sallow[9], wallet[9], willet[9], tallow[9], twills[9], towies[9], lowest[9], owlets[9], towels[9], leally[9], easily[9], alleys[9], allyls[9], aliyos[9], alloys[9], solely[9], lately[9], lealty[9], aliyot[9], lysate[9], slatey[9], lastly[9], tellys[9], stilly[9], tolyls[9], allies[6], taille[6], telial[6], tallol[6], saltie[6], stelai[6], sallet[6], stella[6], tallis[6], illest[6], listel[6], osteal[6], solate[6], toiles[6], allots[6], atolls[6]

5 letter words

wally[11], welly[11], willy[11], yowie[11], lowly[11], yawls[11], wyles[11], yowes[11], yowls[11], wetly[11], stewy[11], wytes[11], allow[8], swale[8], wales[8], weals[8], swail[8], wails[8], lewis[8], lweis[8], wiles[8], walls[8], swell[8], wells[8], swill[8], wills[8], awols[8], lowes[8], lowse[8], tawie[8], twill[8], towie[8], owlet[8], towel[8], sweat[8], tawse[8], twaes[8], waste[8], waist[8], waits[8], wites[8], welts[8], wilts[8], alley[8], allyl[8], alloy[8], loyal[8], lolly[8], lyase[8], sally[8], yells[8], silly[8], slily[8], yills[8], laity[8], tally[8], telly[8], tolyl[8], yeast[8], yetis[8], salty[8], slaty[8], style[8], silty[8], styli[8], ileal[5], aisle[5], lisle[5], lalls[5], aloes[5], solei[5], ollas[5], salol[5], losel[5], lilos[5], lolls[5], telia[5], teloi[5], toile[5], allot[5], atoll[5], least[5], setal[5], slate[5], stale[5], steal[5], stela[5], taels[5], tales[5], teals[5], tesla[5], alist[5], litas[5], tails[5], islet[5], istle[5], stile[5], tiles[5], stall[5], talls[5], tells[5], lilts[5], still[5], tills[5], stoae[5], toeas[5], iotas[5], ostia[5], stoai[5], altos[5], lotas[5], tolas[5], stole[5], telos[5], toles[5], toils[5], tolls[5]

4 letter words

ilea[4], leal[4], lall[4], aloe[4], olea[4], olla[4], lilo[4]