The word afterburners 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: 20
Highest Scoring Words With Friends™ Plays In The Letters afterburners
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Seven Letter Word Alert: (52 words)
austere, banters, barrens, barters, bearers, beaters, berates, burners, bursate, butanes, butenes, earners, earnest, eastern, ensurer, erasure, errants, euaster, feature, ferrets, fraters, furanes, natures, nearest, neuters, rafters, ranters, rebater, rebates, reburns, reburst, refrets, refuser, refuter, refutes, renters, rerents, retears, retunes, returns, saunter, serrate, sterane, sterner, subtree, tearers, tenures, terrane, turbans, turners, unreset, ureters