The word interspecific 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: 26
Highest Scoring Words With Friends™ Play In The Letters interspecific
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Seven Letter Word Alert: (71 words)
centers, centres, centric, cistern, citrine, cretins, crispen, critics, eccrine, enteric, enticer, entices, entries, fencers, firepit, icteric, inciter, incites, inepter, infects, inspect, inspire, irenics, niftier, pectens, pectins, percent, perfect, picnics, picrite, pierces, pieties, pincers, pinfire, pitiers, precent, precise, prefect, present, presift, princes, pterins, receipt, recipes, recites, refects, refines, reifies, repents, repines, respect, respice, respite, scenter, scepter, sceptic, sceptre, science, sericin, serpent, sincere, snifter, specter, spectre, spicier, spinier, terpine, tiepins, tipsier, triceps, trienes