The word heterodactyl 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 heterodactyl
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Seven Letter Word Alert: (95 words)
acolyte, alerted, altered, archlet, athlete, caroled, catered, cathode, cattery, charted, chatted, chattel, chatter, cheated, cheater, cheerly, chelate, cholate, cholera, chorale, chortle, clatter, cleared, clothed, clotted, clotter, codetta, cohered, cordate, cotylae, cotylar, created, deathly, decayer, declare, decoyer, delator, delayer, deltate, detract, earthed, earthly, elector, erectly, healder, hearted, hectare, hydrate, latched, lathery, layered, leached, leacher, leadeth, leather, lechery, leotard, loathed, loather, located, lottery, lyrated, oracled, ratchet, rathole, rattled, reached, reacted, recheat, redealt, relaced, related, relayed, retched, reteach, retotal, roached, rotated, teacher, theater, theatre, thereat, thereto, thready, throaty, torched, totaled, treacle, treacly, treadle, treated, trochee, yachted, yachter, yodeler