The word contaminants 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: 21
Highest Scoring Words With Friends™ Play In The Letters contaminants
:
Seven Letter Word Alert: (30 words)
actants, actions, amnions, anoints, atomics, atonias, atonics, attains, cannons, cantons, cations, catmint, coatman, contain, incants, instant, maniacs, mansion, masonic, nations, octants, satanic, scatoma, somatic, stamina, stannic, station, stomata, tannins, tomcats