The word calciferous 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™ Play In The Letters
Seven Letter Word Alert: (52 words)
accrues, accurse, accuser, acerous, auricle, calicos, caloric, calorie, careful, carouse, caseful, celcius, celosia, circles, clerics, closure, coalers, coalier, coalise, coeliac, crucial, curials, earfuls, eclairs, escolar, failure, ferulic, focuser, frolics, loafers, lousier, occluse, occular, oculars, oracles, oscular, ourself, recoals, recoils, recusal, refocus, refusal, rosalic, saucier, scalier, scoriac, scoriae, secular, sluicer, solacer, surface, uricase