The word heathenisms 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™ Play In The Letters heathenisms
:
Seven Letter Word Alert: (32 words)
anthems, ashiest, atheise, atheism, easiest, ethanes, haemins, hastens, heathen, hessite, inmates, inseams, matinee, meanest, meanies, messiah, methane, misseat, nemesis, sateens, seitans, seitens, senates, sensate, sestina, sestine, sheathe, sheaths, siamese, siemens, stamens, theisms