The word subtracters 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 subtracters
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Seven Letter Word Alert: (51 words)
abusers, abutter, actress, acutest, arrests, astuter, barters, basters, batters, becrust, bracers, breasts, bursars, bursate, busters, butters, carters, casters, causers, cauters, crasser, craters, curates, cursers, cutrate, cutters, rasters, ratters, reburst, recasts, rescrub, restart, retract, saucers, scarers, scatter, starers, starter, staters, statues, stature, stratus, subcase, subrace, subsect, subtest, sucrase, tasters, tracers, truster, turrets