The word astronavigation 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™ Play In The Letters astronavigation
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Seven Letter Word Alert: (83 words)
against, agarans, agnosia, agonist, airings, anginas, anoints, arising, artisan, atonias, atoning, attains, avatars, aviator, gastrin, goannas, grottos, ignitor, ingrain, instant, intorts, introns, invitro, ironing, ivorist, nations, nirvana, nonarts, nonriot, noosing, notator, notions, orating, oration, origins, ovarian, ovation, raining, raising, ranting, ratings, rations, ratting, rattons, rattoon, ravings, rinsing, rioting, risotto, roaning, rooting, rotting, sangria, savanna, signora, sitting, snaring, snoring, soaring, sooting, sorting, staring, stating, station, staving, stiving, stoning, storing, straint, tartans, tasting, tinting, tooting, torsion, transit, tsarina, vaginas, vagrant, variant, vatting, virgins, virions, visitor