The word gatecrasher 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 gatecrasher
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Seven Letter Word Alert: (62 words)
acaters, acerate, acreage, aerates, archers, careers, cartage, carters, caseate, catarrh, caterer, cerates, charger, charges, charter, chaster, cheater, crasher, craters, creaser, creates, earache, eartags, etchers, garrets, garters, gathers, gearset, graters, greaser, greater, hearers, heaters, hectare, hetaera, ratrace, reacher, reaches, rechart, recheat, recrate, regears, regrate, regrets, rehears, reheats, reshare, restage, retches, reteach, retears, retrace, serrate, shearer, teacher, teaches, tearers, teargas, terrace, tracers, trachea, trasher