The word amplitudes 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™ Plays In The Letters amplitudes
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Seven Letter Word Alert: (49 words)
amplest, amulets, aplites, dampest, details, dialups, dilates, dilutes, dimples, dispute, dualise, dualism, dualist, duelist, impaled, impales, impetus, impulse, imputed, limpest, limpets, medusal, mildest, misdate, misdeal, mislead, mispled, palmist, palsied, pastime, pilates, plaited, plasmid, plastid, plaudit, psalmed, pulsate, saluted, sampled, slumped, stadium, stamped, stapled, stipula, stipule, stumped, tediums, updates, uptimes