The Collaborative International Dictionary of English v.0.48:

Workmanship \Work"man*ship\, n.
   1. The art or skill of a workman; the execution or manner of
      making anything.
      [1913 Webster]

            Due reward
            For her praiseworthy workmanship to yield.
                                                  --Spenser.
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            Beauty is nature's brag, and must be shown . . .
            Where most may wonder at the workmanship. --Milton.
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   2. That which is effected, made, or produced; manufacture,
      something made by manual labor.
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            Not any skilled in workmanship embossed. --Spenser.
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            By how much Adam exceeded all men in perfection, by
            being the immediate workmanship of God. --Sir W.
                                                  Raleigh.
      [1913 Webster]

WordNet (r) 3.0 (2006):

workmanship
    n 1: skill in an occupation or trade [syn: craft,
         craftsmanship, workmanship]

Moby Thesaurus II by Grady Ward, 1.0:

101 Moby Thesaurus words for "workmanship":
   ability, address, adeptness, adroitness, airmanship, architecture,
   artfulness, artisanship, artistry, assembly, bravura, brilliance,
   building, capability, capacity, casting, cleverness, command,
   competence, composition, construction, control, conversion,
   coordination, craft, crafting, craftsmanship, creation,
   cultivation, cunning, deftness, devising, dexterity, dexterousness,
   dextrousness, diplomacy, efficiency, elaboration, erection,
   expertise, extraction, fabrication, facility, fashioning, finesse,
   formation, forming, formulation, framing, grace, grip, growing,
   handicraft, handiness, handiwork, harvesting, horsemanship,
   ingeniousness, ingenuity, know-how, machining, making, manufacture,
   manufacturing, marksmanship, mastership, mastery, milling, mining,
   molding, practical ability, prefabrication, preparation,
   processing, producing, proficiency, prowess, quickness, raising,
   readiness, refining, resource, resourcefulness, savoir-faire,
   savvy, seamanship, shaping, skill, skillfulness, smelting, style,
   tact, tactfulness, technical brilliance, technical mastery,
   technical skill, technique, timing, virtuosity, wit, wizardry