The word watercourse 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: 18
Highest Scoring Words With Friends™ Play In The Letters watercourse
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Seven Letter Word Alert: (68 words)
acerose, acerous, arouser, austere, careers, carouse, carrots, carters, caterer, cauters, cerates, coarser, coaster, courser, craters, creaser, creates, creator, cuatros, curates, curator, erasure, erector, euaster, outrace, outwear, reactor, rearose, recoats, recower, recrate, rectors, recures, recurse, reroast, reroute, rescore, rescuer, restore, reswear, reswore, retears, retours, retrace, rewater, rewrote, roaster, roseate, routers, scourer, scouter, screwer, securer, serrate, swearer, sweater, tarrows, tearers, terrace, tourers, tracers, trocars, trouser, ureters, urostea, waterer, wearers, wrester