The word subtractive 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: 22
Highest Scoring Words With Friends™ Play In The Letters subtractive
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Seven Letter Word Alert: (55 words)
abusive, abutter, activer, actives, acutest, artiest, ascribe, astuter, attires, baiters, barites, batters, battier, becrust, bitrate, bitters, bravest, brucite, bursate, bustier, butters, butties, cattier, cauters, citrate, cristae, curates, cursive, cutrate, cutters, iratest, raciest, ratbite, rebaits, revuist, saucier, scatter, situate, statice, stative, stature, striate, subrace, subvert, tastier, terabit, tribute, trisect, trivets, uricase, varices, veritas, vibrate, virtues, viscera