The word tiebreakers 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 tiebreakers
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Seven Letter Word Alert: (47 words)
aeriest, arbiter, artsier, baiters, barites, barkers, barters, batiker, beakers, bearers, beaters, berates, berries, berserk, braiser, brasier, breaker, brisker, brisket, eeriest, karites, rarebit, reakers, rearise, rebaits, rebakes, rebater, rebates, rebites, reekers, reekier, restake, retaker, retakes, retears, retiree, retires, retrees, retries, seriate, serrate, starker, steerer, striker, tarries, tearers, tearier