The word polyamides 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (36 words)
adipose, amyloid, deploys, deposal, despoil, dialyse, dimples, diploma, dipoles, display, employs, eomyids, impaled, impales, implode, imposed, lipomas, maypole, misdeal, mislead, misplay, mispled, myeloid, paisley, palsied, plasmid, pomades, psalmed, pyemias, samoyed, sampled, soapily, soliped, someday, splayed, spoiled