The word featureless 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: 16
Highest Scoring Words With Friends™ Plays In The Letters featureless
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Seven Letter Word Alert: (53 words)
artless, auletes, austere, earfuls, earless, elaters, eluates, estrual, euaster, eustele, falsest, falters, feature, feelers, festers, fetuses, fleeter, fluster, fluters, fuelers, furless, leasers, lusters, realest, reflate, refuels, refusal, refuses, refutal, refutes, relates, release, resales, reseals, reseats, restful, results, rustles, saluter, salutes, sealers, seaters, slaters, stealer, sulfate, sutlers, taluses, tealess, tearful, teasels, teasers, treeful, ureases