The word stockinettes 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 stockinettes
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Seven Letter Word Alert: (34 words)
cenotes, cession, coesite, consist, contest, cosiest, cosines, entices, incests, insects, ketones, ketoses, ketosis, ketotic, kineses, kittens, necktie, nosiest, notices, notists, octenes, oecists, section, seitens, sestine, sickens, sickest, sockets, stenose, stetson, tensest, tickets, tocsins, tonette