The word arraignment 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: 18
Highest Scoring Words With Friends™ Play In The Letters arraignment
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Seven Letter Word Alert: (56 words)
agatine, amentia, angrier, animate, antigen, arraign, arrange, earning, earring, entrain, garment, gateman, gentian, grainer, granite, granter, grinner, ingrate, magenta, magnate, manager, mangier, margate, mariner, marring, martian, meaning, migrant, migrate, minaret, mintage, nametag, narrate, nearing, ragtime, raiment, rangier, ranting, reaming, rearing, regnant, regrant, remnant, renting, retrain, ringman, ringmen, tanager, tangier, tangram, tarring, teaming, tearing, terrain, trainer, trigram