The word monometallic 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: 24
Highest Scoring Words With Friends™ Play In The Letters monometallic
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Seven Letter Word Alert: (31 words)
aconite, ailment, aliment, alltime, aloetic, ammonic, calomel, climate, coalite, coalmen, collate, colonel, comment, coolant, elation, emotion, lactone, lection, mailmen, metical, micella, monocle, moonlit, nematic, netmail, oolemma, toenail, tollman, tollmen, toolman, toolmen