The word instantaneous 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: 17
Highest Scoring Words With Friends™ Plays In The Letters instantaneous
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Seven Letter Word Alert: (46 words)
anoints, antenna, atonias, attains, attunes, aunties, autists, instant, instate, intents, intones, nannies, nations, nonanes, nonsane, nonsuit, noseans, nosiest, notists, outsets, outsits, satiate, seitans, sestina, siennas, sinuate, situate, sonatas, sonnets, statins, station, statues, stetson, sunnies, suntans, sustain, tannest, tannins, taoists, tautens, tenants, tension, tetanus, teutons, unseats, unstain