The word tightropes 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: 17
Highest Scoring Words With Friends™ Play In The Letters tightropes
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Seven Letter Word Alert: (32 words)
egotist, egotrip, ghettos, goiters, goitres, gophers, goriest, gothite, hitters, hogties, ogreish, pettish, pothers, potters, potties, protest, protist, resight, ropiest, rosehip, shitpot, sighter, spotter, spright, strophe, thorite, tighter, tipster, tiptoer, tiptoes, tithers, tropist