The word pteridophyte 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: 23
Highest Scoring Words With Friends™ Play In The Letters pteridophyte
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Seven Letter Word Alert: (30 words)
diether, diopter, dioptre, dottier, eophyte, epidote, epithet, epitope, eyedrop, peptide, peridot, pettier, pipette, popeyed, pottery, preedit, pretype, prophet, repiped, retyped, tepider, thereto, thorite, thyroid, tiptoed, tiptoer, treetop, tripped, typhoid, yperite