The word macrophages 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: 24
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (30 words)
agarose, amorphs, amphora, caeomas, cameras, campers, camphor, cargoes, carhops, charges, cheapos, chomper, chromes, compare, corsage, eparchs, geomaps, gophers, hampers, homages, marches, parches, poacher, poaches, porches, rampage, roaches, rosacea, sarcoma, scamper