The word mammographies is playable in Words With Friends™, but 1 blank substituting for the letter 'm' is 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: 25
Highest Scoring Words With Friends™ Plays In The Letters mammographies
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Seven Letter Word Alert: (38 words)
agarose, airgaps, amorphs, amphora, epigram, gaspier, geomaps, gophers, hammers, hammier, hampers, harpies, heroism, hoagies, homages, imagers, imagoes, imposer, isogram, magpies, maimers, memoirs, mirages, mishear, mispage, mommies, ogreish, pariahs, primase, promise, rampage, rosehip, shammer, sharpie, shimmer, soapier, spammer, spiraea