The word oligochaetes 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 oligochaetes
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Seven Letter Word Alert: (69 words)
achiest, aiglets, aitches, alecost, alethic, alights, aloetic, atheise, cagiest, cahoots, castile, catelog, celosia, chalets, chelate, cholate, clothes, coalise, coalite, coesite, coltish, coolest, cooties, eaglets, elastic, elegaic, elegiac, elegist, elegits, elogies, elogist, ethical, galoots, gasohol, gelates, gelatos, goalies, goatees, goatish, gooiest, gotchas, gothics, haglets, halites, helices, hoagies, hogties, holiest, hostile, isolate, laciest, lactose, latches, leaches, legates, ligates, loathes, locates, ocelots, oleates, oolites, ooliths, ootheca, satchel, sleight, stoical, stoolie, teaches, techies