different between merchantability vs merchantable

English

merchant +? -ability

merchantability (uncountable)

merchant +? -able

merchantable (comparative more merchantable, superlative most merchantable)

Fit for the market, i.e. suitable for selling for an ordinary price. Sometimes, this is a technical designation for a particular kind or class.
- March 1858, Nathan Clifford in the United States Supreme Court, Leonard v. Davis 66 U.S. 476
  The defendants pleaded the general issue, with notice of the set-off, averring that but a part of the logs ever came to their possession, and of this part but a few were merchantable, the balance of them being worthless, and claiming damages for the inferior quality of the logs.

merchantable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

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