The word kilometres 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: 18
Highest Scoring Words With Friends™ Play In The Letters kilometres
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Seven Letter Word Alert: (32 words)
emoters, erotise, estriol, irksome, isomere, kestrel, kilters, kirtles, loiters, melters, meteors, metrise, milkers, moister, mortise, motlier, omelets, reemits, remelts, remotes, resmelt, restoke, retiles, retimes, roselet, skelter, smelter, smokier, sterile, telomer, toelike, toilers