The word placoderms 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 placoderms
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Seven Letter Word Alert: (58 words)
campers, caroled, carpels, clamors, clamped, clamper, clasped, clasper, clomped, coalers, compare, compels, comrade, cradles, cramped, dampers, decamps, deposal, earldom, earmold, escolar, leopard, loaders, molders, morales, oracled, oracles, ordeals, parcels, paroled, paroles, placers, placode, pomades, preload, premold, presold, psalmed, radomes, reclads, reclamp, reclasp, recoals, reloads, remolds, sampled, sampler, sarcode, scalped, scalper, scamped, scamper, scarped, scolder, scraped, smolder, solaced, solacer