The word redbreasts 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (54 words)
arrests, barreed, barters, basters, bearers, beaters, bedares, bedress, bedrest, berated, berates, brassed, breasts, darters, dearest, debaser, debases, debater, debates, deserts, dessert, dresser, erasers, rasters, readers, reasted, rebased, rebases, rebated, rebater, rebates, redates, redress, rereads, reseats, resters, retards, retears, retrade, retread, sabered, seabeds, seaters, sedater, sedates, serrate, starers, starred, tasered, tearers, teasers, traders, treader, tressed