The word intravasation 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: 19
Highest Scoring Words With Friends™ Play In The Letters intravasation
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Seven Letter Word Alert: (26 words)
anoints, artisan, atonias, attains, avatars, aviator, instant, intorts, introns, invitro, ivorist, nations, nirvana, nonarts, ovarian, rations, rattons, savanna, station, straint, tartans, transit, tsarina, variant, virions, visitor