The word harmonisers 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (54 words)
animose, anomers, armoire, arshine, arshins, enamors, haemins, harness, hernias, heroins, heroism, hoarier, hoarser, hornier, horsier, hosiers, inseams, inshore, ironers, isomers, mariner, marines, marries, marshes, mashers, menorah, messiah, mishear, moaners, moraine, mossier, oarsmen, raisers, ransoms, rashers, reasons, reharms, remains, reshims, rinsers, roamers, romaine, seminar, seniors, sermons, sharers, shiners, shrines, sierras, sirname, smasher, snarers, snorers, soarers