The word lockstitches 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: 25
Highest Scoring Words With Friends™ Play In The Letters lockstitches
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Seven Letter Word Alert: (41 words)
chisels, choices, choleic, ciscoes, cliches, cloches, closest, closets, clothes, cockets, cockish, coltish, cosiest, holiest, hostels, hostile, isohels, ketosis, ketotic, kittles, lockets, lockset, oecists, ossicle, schlock, schtick, schtiks, shlocks, shticks, sickest, sickles, skittle, sockets, stickle, theists, thicket, thistle, tickets, tickles, tictocs, toilets