The word astronomer 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: 14
Highest Scoring Words With Friends™ Play In The Letters astronomer
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Seven Letter Word Alert: (36 words)
anomers, armrest, artsmen, atoners, enamors, errants, maestro, maroons, martens, matrons, mentors, meronts, moaners, monster, mortars, oarsmen, orators, ornater, osteoma, ranters, reroast, reroots, roamers, roaster, roomers, rooster, rooters, searoom, senator, smarten, smarter, snorter, tearoom, tonearm, treason, tremors