The word leucadendron 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: 21
Highest Scoring Words With Friends™ Play In The Letters leucadendron
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Seven Letter Word Alert: (59 words)
adducer, adorned, aureole, caldron, candled, candler, caroled, cleaned, cleaner, cleared, clodder, clouded, coddler, corneal, cradled, crunode, cuddler, curdled, dandler, declare, decoder, deducer, deluder, dendron, denuder, educand, encoded, encoder, encored, endured, launder, learned, nodular, noduled, nonlead, nonreal, nuanced, nuclear, nucleon, oracled, recaned, reclean, reclone, recoded, redound, reduced, relaced, rounded, roundel, ulcered, uncared, unclean, unclear, uncoded, uncored, unended, unlaced, unladen, unlearn