The word reductants 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™ Play In The Letters reductants
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Seven Letter Word Alert: (65 words)
acutest, astuter, asunder, attends, attuned, attunes, canters, cantred, cauters, centaur, crudest, crusade, crusted, curated, curates, custard, cutrate, cutters, dancers, decants, decrust, descant, detract, ductase, encrust, entrust, natters, natured, natures, nectars, nutcase, nutters, recants, redacts, reducts, saunter, scanter, scatted, scatter, stander, started, statued, stature, student, stunted, stunter, taunted, taunter, tautens, tetanus, traduce, traduct, tranced, trances, truants, trusted, tundras, uncared, uncarts, uncased, uncrate, undrest, unrated, unsated, untread