The word sterlings 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: 13
Highest Scoring Words With Friends™ Play In The Letters sterlings
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Seven Letter Word Alert: (28 words)
enlists, girnels, glisten, glister, gristle, ingests, ingress, inserts, lingers, listens, relists, resigns, resting, ringlet, signers, signets, silents, singers, singles, singlet, sinters, slinger, stinger, strings, tigress, tingler, tingles, tinsels