The word cockatiels is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 21
Highest Scoring Words With Friends™ Play In The Letters cockatiels
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Seven Letter Word Alert: (33 words)
accites, alecost, aloetic, ascetic, cackles, cacolet, cakiest, calcite, calicos, castile, catlike, celosia, clastic, coalise, coalite, cockals, cockets, coeliac, elastic, isolate, laciest, lactose, locates, lockets, lockset, oatlike, saclike, seacock, stickle, stoical, tackles, talkies, tickles