The word preservative 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: 23
Highest Scoring Words With Friends™ Plays In The Letters preservative
:
Seven Letter Word Alert: (67 words)
aeriest, arrives, artsier, aspirer, averser, averter, eeriest, evasive, parties, pastier, peatier, peevers, pervert, pirates, praiser, praters, private, raspier, reapers, rearise, reavers, repairs, reparse, repaste, repaver, repaves, repeats, reprise, rerapes, reserve, respire, respite, restive, restrap, retapes, retears, retiree, retires, retraps, retrees, retries, reveres, reverie, reverse, reverts, reviser, reviver, revives, riveter, savvier, seepier, seriate, serrate, severer, sievert, spearer, starver, steeper, steerer, striper, striver, taperer, tarries, tearers, tearier, traipse, veritas