The word hydrodynamics 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: 28
Highest Scoring Words With Friends™ Plays In The Letters hydrodynamics
:
Seven Letter Word Alert: (55 words)
acronym, adhorns, anchors, android, archons, caddish, candors, chamois, chroman, chrysin, corands, crayons, crimson, cyanids, cyanoid, diamond, diandry, diarchy, dirhams, discard, discord, dishorn, domains, donairs, drachms, dyadics, dyarchy, dynamic, dynamos, hadrons, hairdos, harmony, hydroma, hymnody, inroads, ironyms, isonymy, marconi, masonic, masonry, microns, middays, midrash, monarch, mondays, moschid, myriads, nimrods, nomadic, nordics, orchids, ordains, randoms, synarch, synodic