The word breastpin 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: 16
Highest Scoring Words With Friends™ Play In The Letters breastpin
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Seven Letter Word Alert: (26 words)
antsier, baiters, banters, baptise, barites, entraps, nastier, painter, panters, panties, parents, parties, pastier, patines, pertain, pirates, pretans, pterins, rebaits, repaint, restain, retains, retinas, stainer, traipse, trepans