The word earthling 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (32 words)
aligner, alright, elating, enlight, enthral, gelatin, genital, granite, hairnet, halting, healing, hearing, heating, hernial, ingrate, inhaler, lathing, latrine, learing, lighten, lighter, ratline, realign, reliant, relight, retinal, ringlet, tagline, tangier, tearing, tingler, trenail