The word autochthones 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: 21
Highest Scoring Words With Friends™ Play In The Letters autochthones
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Seven Letter Word Alert: (30 words)
acutest, attunes, cahoots, cashout, chasten, chaunts, contest, costate, cottons, etchant, hatches, hatchet, hotshot, housane, hunches, hutches, notches, nutcase, octanes, octants, ootheca, outcast, outshot, staunch, tautens, tetanus, teutons, toucans, touches, unteach