The word metabolites 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 metabolites
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Seven Letter Word Alert: (33 words)
albites, altoist, astilbe, atomise, batlets, battles, beamlet, beslime, betimes, betitle, betoils, bimetal, biotest, boletes, bottles, isolate, itemset, latites, libates, maltose, mettles, mobiles, mottles, oleates, omelets, setbolt, stomate, tablets, teatime, teleost, timbale, toilets, totable