The word convertibility 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: 28
Highest Scoring Words With Friends™ Play In The Letters convertibility
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Seven Letter Word Alert: (47 words)
binocle, biolite, biotite, bitcoin, bittier, blotter, bottler, brevity, brittle, byliner, citrine, cittern, clitter, clotter, convert, cornett, cornily, evictor, inciter, inertly, inocyte, inviter, invitro, invoice, lection, liberty, lintier, lottery, niobite, nitrite, nittier, novelty, olivine, overbit, overlit, overtly, ovinely, retinol, tintier, titivil, trilobe, trinity, viceroy, victory, violent, vitrine, vitriol