The word argentous 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: 13
Highest Scoring Words With Friends™ Play In The Letters argentous
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Seven Letter Word Alert: (23 words)
argents, atoners, garnets, gaunter, gunters, natures, onstage, oranges, outages, outearn, outrage, outsang, ragouts, saunter, senator, storage, strange, surgeon, tongues, tonsure, treason, unstage, urostea