The word schoolmates 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: 20
Highest Scoring Words With Friends™ Play In The Letters schoolmates
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Seven Letter Word Alert: (43 words)
alecost, cahoots, calmest, castles, chalets, chaoses, cholate, chooses, clashes, closest, closets, clothes, coeloms, coolest, hamlets, hatless, hostels, lactose, latches, loathes, locates, loosest, maltose, mascots, matches, molests, mooches, moolahs, ocelots, ootheca, osteoma, sachets, satchel, scathes, schemas, schools, scotoma, seamost, shmoose, smooths, solaces, soothes, stomach