The word venerableness 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
Seven Letter Word Alert: (41 words)
baleens, banners, beavers, bereave, beslave, blesser, braless, earless, elevens, enabler, enables, enseals, ensears, enslave, ensnare, ensnarl, laveers, leaners, leasers, leavens, leavers, rebales, rebases, rebless, release, resales, resaves, reseals, reveals, salvers, sealers, seeable, servals, several, slavers, sleaves, sleeves, veneers, veneral, verbals, verbena