The word instantaneousness cannot be made in Words With Friends™. It is 17 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters instantaneousness
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Seven Letter Word Alert: (76 words)
anoints, antenna, assents, assists, atonias, attains, attunes, aunties, autists, easiest, ensuite, estates, estuate, instant, instate, intense, intents, intones, nannies, nations, neatens, neatest, neonate, nonanes, nonenes, nonsane, nonsuit, noseans, nosiest, notists, oneness, osseins, outsees, outsets, outsits, sateens, satiate, seasons, seitans, seitens, senates, sensate, session, sestets, sestina, sestine, siennas, siestas, sinuate, sinuses, situate, sonatas, sonnets, statins, station, statues, stenose, stetson, sunnies, sunsets, suntans, sustain, tannest, tannins, taoists, tautens, tenants, tensest, tension, tetanus, teutons, tissues, tsetses, uneaten, unseats, unstain