The word physiologists 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™ Play In The Letters physiologists
:
Seven Letter Word Alert: (24 words)
ghostly, gliosis, goosish, gossips, gossipy, oligist, ooliths, pistils, pistols, pithily, plights, postils, sightly, slights, soloist, soothly, sootily, spigots, stylish, stylops, tipsily, topsoil, toyshop, tylosis