The word chromoplasts 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™ Play In The Letters chromoplasts
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Seven Letter Word Alert: (44 words)
amorphs, cahoots, caltrop, camphor, captors, carhops, carpool, castors, chorals, clamors, cohorts, compart, compass, comport, compost, costars, harlots, locator, mascots, moolahs, mortals, ooplasm, ooplast, pastors, patrols, poromas, portals, prosoma, scholar, schools, schorls, scotoma, scrotal, shampoo, smooths, sophtas, sortals, splatch, splotch, stomach, stroams, stromal, taproom, toparch