The word phanerogams 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: 22
Highest Scoring Words With Friends™ Play In The Letters phanerogams
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Seven Letter Word Alert: (37 words)
agarose, amorphs, amphora, anomers, apogean, enamors, engrasp, geomaps, gnasher, gophers, hampers, hangars, hangers, homages, manager, manages, mangers, mangoes, menorah, moaners, mongers, oarsman, oarsmen, oranges, orphans, paragon, persona, rampage, rehangs, repoman, ropeman, sangoma, saphena, sharpen, shopman, shopmen, sponger