The word camelhairs 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
Seven Letter Word Alert: (24 words)
achiral, aerials, archeal, cameras, caramel, cashier, chimera, claimer, clasher, eclairs, larches, mailcar, mailers, malaise, malices, marches, marshal, miracle, mishear, realism, reclaim, remails, scalier, shalier