The word erythroblast 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 erythroblast
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Seven Letter Word Alert: (94 words)
abettor, aborter, barleys, barrels, barters, bathers, bathtoy, batlets, batters, battery, battler, battles, beastly, betrays, betroth, blaster, blather, bloater, blotter, boaster, boaters, bolster, bolters, borates, bothers, bottler, bottles, brasher, brashly, brayers, breaths, breathy, brothel, brother, earshot, earthly, halters, harbors, harlots, hatters, herbals, herbary, hoarser, holster, hostler, laborer, lathers, lathery, loather, loathes, lobster, lottery, rathole, ratters, rattler, rattles, realtor, rebaths, reblast, reboast, reroast, restart, retoast, retorts, retotal, rhetors, roaster, rostral, rotates, rotters, setbolt, shatter, shorter, shortly, slather, soberly, sorbate, stabler, starlet, starter, startle, stately, stealth, strayer, stylate, tablets, threats, throats, throaty, toaster, totable, trasher, tryster, tylotes