The word amaryllises 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: 18
Highest Scoring Words With Friends™ Play In The Letters amaryllises
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Seven Letter Word Alert: (30 words)
aerials, aimless, airless, airmass, aliases, allayer, amylase, armless, assayer, mailers, malaise, messily, millers, miserly, mislays, misrely, rallies, rayless, realism, reassay, remails, resails, rimless, sailers, salamis, serials, slayers, smaller, smilers, smileys