The word gastromycetes 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: 23
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (98 words)
acerose, actress, amerces, cargoes, casters, castors, cattery, cerates, coaster, corsage, corsets, costars, costate, cottage, cotters, creases, creates, cremate, cresset, cystoma, cytomas, ecstasy, emoters, escorts, essayer, estates, gametes, garotte, gearset, geostat, gestate, geysers, goatees, grayest, greases, greyest, gyrates, maestro, mascots, masters, mastery, matters, message, meteors, mossery, mycoses, octamer, oysters, racemes, recasts, recoats, remates, remotes, reseats, resects, restage, restate, restems, retaste, reteams, retests, retoast, roseate, rosette, rotates, scatter, screams, screamy, seagoer, seamers, seamost, seaters, secrets, sectors, setters, smatter, stagers, staters, stayers, steamer, stereos, stogeys, stomate, storage, storeys, streams, streamy, streets, stroams, targets, tasters, teasers, tersest, testacy, testers, toaster, tomcats, tyromas