The word detainments 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (52 words)
adenine, aniseed, attends, demates, demeans, dements, dentate, dentine, dentins, dentist, destain, destine, detains, detents, distant, eminent, emitted, enamine, indents, inmates, instant, instate, instead, intends, intense, intents, itemset, maidens, matinee, meanest, meanies, medians, mediate, mindset, misdate, mittens, neatens, neatest, sainted, sandmen, sideman, smitten, stained, standee, steamed, stented, stinted, tainted, tandems, tannest, teatime, tenants