The word harbingered 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (61 words)
abridge, adherer, angered, angrier, barreed, barring, beadier, beading, bearing, bendier, berried, bighead, braider, brained, brander, brigade, bringer, deraign, derange, dernier, drainer, earring, enraged, gerbera, gnarred, grained, grainer, grander, grenade, grinder, hagride, handier, hardier, headier, heading, hearing, heeding, herbage, herding, herring, inbreed, neighed, nerdier, rabider, randier, rangier, readier, reading, rearing, rebadge, rebegan, rebegin, rebraid, rebrand, regrade, regrind, reheard, rehinge, rehired, reigned, reigner