The word largemouths 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: 20
Highest Scoring Words With Friends™ Play In The Letters largemouths
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Seven Letter Word Alert: (62 words)
amulets, armhole, armlets, authors, earshot, elutors, emulsor, estrual, gaolers, gathers, gelatos, glamour, gloater, goulash, gourmet, gumshoe, haglets, halters, hamlets, hamster, harlots, haulers, holster, homages, hostler, humeral, humoral, hurtles, largest, lathers, laugher, loather, loathes, maestro, maltose, matures, maulers, morales, morgues, mortals, morulas, mothers, mugshot, outages, outrage, ragouts, rathole, saluter, serumal, shouter, slather, smother, sorghum, storage, stromal, temurah, thermal, thermos, tougher, tramels, troughs, urostea