The word chemotherapy 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: 27
Highest Scoring Words With Friends™ Play In The Letters chemotherapy
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Seven Letter Word Alert: (42 words)
amorphy, apocyte, atrophy, camphor, chapter, cheaper, cheater, cheetah, chomper, compare, compart, compere, compete, cremate, ecotype, ecthyma, empathy, eophyte, eparchy, heather, hectare, machete, matcher, octamer, operate, poacher, preachy, precoat, preheat, recheat, rematch, repatch, reteach, teacher, tempera, tempore, thearch, theorem, therapy, toparch, trochee, yachter