The word kindergarten 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: 21
Highest Scoring Words With Friends™ Plays In The Letters kindergarten
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Seven Letter Word Alert: (98 words)
adenine, angered, angrier, antigen, arenite, darning, darting, dentine, denting, deraign, derange, dernier, detrain, dragnet, drainer, drinker, earning, earring, engined, enraged, entrain, gentian, gnarred, grained, grainer, grander, granite, granted, grantee, granter, greaten, greater, grenade, grinder, grinned, grinner, inerter, ingrate, integer, keening, keratin, kerning, kernite, knarred, kneader, kneeing, nearing, needing, negated, nerdier, nitrene, randier, rangier, ranking, ranting, readier, reading, reagent, reaking, rearing, reeking, regnant, regrade, regrant, regrate, regrind, reigned, reigner, reinked, reinter, rending, renting, retaken, retaker, retired, retrade, retrain, retread, retried, tangier, tanking, tardier, tarried, tarring, tearier, tearing, tending, terrain, terrane, tireder, tradein, trading, trained, trainee, trainer, treader, treeing, triaene