The word rearmaments 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 rearmaments
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Seven Letter Word Alert: (38 words)
aerates, ammeter, armrest, artsman, artsmen, earners, earnest, eastern, emanate, errants, manatee, mantras, martens, meanest, metamer, narrate, nearest, rammers, ranters, reamers, remates, renames, renters, rerents, reteams, retears, serrate, smarten, smarter, smearer, stammer, steamer, sterane, sterner, tearers, terrane, tramman, trammer