The word assertable 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: 14
Highest Scoring Words With Friends™ Plays In The Letters assertable
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Seven Letter Word Alert: (45 words)
abasers, abaters, ablates, abrases, abreast, aerates, arblast, artless, atlases, basalts, basters, beaters, berates, blaster, bleater, blesser, braless, breasts, earless, eatable, elaters, leasers, realest, rebales, rebases, rebates, reblast, rebless, relates, resales, reseals, reseats, sealers, searats, seastar, seaters, slaters, stabler, stables, stealer, tarsals, tealess, teasels, teasers, trebles