The word superfamily 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: 24
Highest Scoring Words With Friends™ Play In The Letters superfamily
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Seven Letter Word Alert: (56 words)
amplify, armfuls, armsful, earfuls, failure, felspar, femural, flamers, flareup, flayers, impaler, impales, impulse, lamprey, lempira, lumpier, mailers, maulers, miserly, misfuel, misplay, misrely, misrule, paisley, palmier, parleys, parsley, perfumy, perusal, pilfers, players, plumier, prelims, primase, primula, prismal, purfles, pyemias, realism, refilms, reflips, refusal, remails, replays, rumples, sampler, serumal, simpler, sparely, splayer, spumier, umpires, upraise, uprisal, yaupers, yearful