The word tightenings 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: 19
Highest Scoring Words With Friends™ Play In The Letters tightenings
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Seven Letter Word Alert: (27 words)
getting, ginseng, hinging, hinnies, hinting, hitting, ignites, insight, intents, nesting, netting, nightie, setting, shining, sieging, sighing, signing, singing, sitting, tensing, tenting, testing, tighten, tinging, tiniest, tinting, tithing