The word archenteron 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: 18
Highest Scoring Words With Friends™ Play In The Letters archenteron
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Seven Letter Word Alert: (36 words)
acetone, another, canteen, caterer, chanter, charter, cheater, coherer, creator, earthen, enactor, enchant, enhance, erector, hearten, hectare, neonate, norther, notcher, ornater, rancher, reacher, reactor, rechart, recheat, recrate, reenact, reteach, retrace, teacher, terrace, terrane, thereon, tranche, trochar, trochee