The word multivalency 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: 28
Highest Scoring Words With Friends™ Play In The Letters multivalency
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Seven Letter Word Alert: (35 words)
acutely, ailment, aliment, alltime, amenity, anytime, calumet, calumny, cauline, cleanly, climate, cutline, cyanite, eluvial, emacity, emulant, latency, laytime, lunatic, meatily, metical, micella, mullite, mycelia, mycetal, naively, naivety, nematic, netmail, nullity, nutmeal, vacuity, valency, victual, vitally