The word chrysanthemum 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: 30
Highest Scoring Words With Friends™ Play In The Letters chrysanthemum
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Seven Letter Word Alert: (90 words)
acumens, amentum, amnesty, anthems, anthers, artsmen, canters, cauters, cautery, centaur, century, chanter, chantey, chasten, chaster, chaunts, chutney, chymase, curates, curtsey, ecthyma, encrust, estuary, eustacy, hammers, hamster, hatches, haunter, hauynes, hearths, humaner, hummers, hunches, hunters, hutches, hymners, manures, marches, martens, mastery, matcher, matches, matures, munches, natures, nectars, nectary, nutcase, ranches, raunchy, recants, rectums, rematch, rhythms, sanctum, saunter, scanter, screamy, scyther, shammer, shunter, smarten, snatchy, stammer, starchy, staunch, stenchy, sternum, streamy, summary, summate, summery, surname, synarch, temurah, thearch, thrummy, trances, tranche, truancy, uncarts, uncharm, uncrate, unearth, unmatch, unmates, unshare, unteach, yachter, yammers