The word echocardiograph 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: 31
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (51 words)
airdrop, airhead, apogaic, apogeic, archaic, cardiac, carried, chaired, charade, charged, charger, charier, charred, chirped, chirper, choicer, choragi, choregi, choroid, coached, cochair, cordage, corpora, corrode, digraph, eardrop, edaphic, goopier, graphed, graphic, hagride, hagrode, haircap, hardier, headcap, hoarder, hoarier, orchard, parader, parched, pharaoh, poached, poacher, pooched, porched, racecar, rapider, regraph, ripcord, roached, roadhog