The word pentagrams 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: 19
Highest Scoring Words With Friends™ Play In The Letters pentagrams
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Seven Letter Word Alert: (42 words)
anapest, aptamer, argents, artsman, artsmen, eartags, engrasp, entraps, garment, garnets, gateman, magenta, magnate, magnets, manager, manages, mangers, mantrap, mantras, margate, martens, nametag, pageant, panters, parents, pargets, peasant, pretans, rampage, rampant, restamp, smarten, spartan, stamper, strange, tampers, tanager, tangram, tapeman, tarpans, teargas, trepans