The word metalanguages 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: 23
Highest Scoring Words With Friends™ Plays In The Letters metalanguages
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Seven Letter Word Alert: (67 words)
agamete, alumnae, amulets, augment, auletes, eaglets, elegant, eluants, eluates, eluents, emanate, emulant, emulate, emulges, enamels, engages, galenas, gametes, gateaus, gateman, gatemen, gelates, gentles, glutens, laments, lasagna, lasagne, lateens, leagues, leanest, legates, legumes, lunates, magenta, magnate, magnets, maleate, manages, manatee, mangles, mantels, mantles, manuals, meanest, melange, menages, mensual, mustang, mutagen, nametag, negates, nestegg, nuggets, nutmeal, nutmegs, sealant, segment, smuggle, snaggle, snuggle, sultana, taggees, tamales, tangles, unmates, unsmelt, unstage