The word aquacultures 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: 28
Highest Scoring Words With Friends™ Play In The Letters aquacultures
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Seven Letter Word Alert: (28 words)
acaters, acquest, actuals, acuates, arcuate, aurates, auscult, austral, auteurs, calquer, calques, cartels, cauters, clarets, cluster, crustal, culture, curates, estrual, lacquer, lactase, racquet, recusal, saluter, scarlet, secular, sulcate, sutural