The word earthliest 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 earthliest
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Seven Letter Word Alert: (65 words)
aeriest, artiest, atheise, atheist, athlete, attires, elaters, halites, halters, hastier, hatters, healers, heaters, hitters, iratest, iterate, lathers, latites, leather, letters, litters, rattish, rattles, realest, realise, realist, reheats, relates, restate, retails, retaste, retiles, retilts, retitle, saltier, seriate, settler, shalier, shatter, shelter, slather, slatier, slither, slitter, starlet, starlit, startle, stealer, stealth, sterile, stilter, striate, tartish, tastier, tertial, testier, tethers, theater, theatre, thereat, thistle, threats, tilters, tithers, trestle