The word foraminifers 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: 22
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (44 words)
affines, affirms, animose, anomers, armoire, enamors, fairies, famines, farmers, fermion, firearm, fireman, foamers, foamier, foramen, forearm, foreman, formers, framers, informs, insofar, ioniser, ironers, ironies, mariner, marines, marries, misfire, moaners, moraine, noisier, oarsmen, rainier, reforms, refrain, remains, rimfire, roamers, romaine, saffron, seminar, siriema, sirname, sniffer