The word subtracter 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: 17
Highest Scoring Words With Friends™ Play In The Letters subtracter
:
Seven Letter Word Alert: (27 words)
abutter, acutest, astuter, barters, batters, becrust, bracers, bursate, butters, carters, cauters, craters, curates, cutrate, cutters, ratters, reburst, rescrub, restart, retract, scatter, starter, stature, subrace, tracers, truster, turrets