The Collaborative International Dictionary of English v.0.48:

Coping \Cop"ing\, n. [See Cope, n.] (Arch.)
   The highest or covering course of masonry in a wall, often
   with sloping edges to carry off water; -- sometimes called
   capping. --Gwill.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cap \Cap\, v. t. [imp. & p. p. Capped; p. pr. & vb. n.
   Capping.]
   1. To cover with a cap, or as with a cap; to provide with a
      cap or cover; to cover the top or end of; to place a cap
      upon the proper part of; as, to cap a post; to cap a gun.
      [1913 Webster]

            The bones next the joint are capped with a smooth
            cartilaginous substance.              --Derham.
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   2. To deprive of cap. [Obs.] --Spenser.
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   3. To complete; to crown; to bring to the highest point or
      consummation; as, to cap the climax of absurdity.
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   4. To salute by removing the cap. [Slang. Eng.]
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            Tom . . . capped the proctor with the profoundest of
            bows.                                 --Thackeray.
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   5. To match; to mate in contest; to furnish a complement to;
      as, to cap text; to cap proverbs. --Shak.
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            Now I have him under girdle I'll cap verses with him
            to the end of the chapter.            --Dryden.
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   Note: In capping verses, when one quotes a verse another must
         cap it by quoting one beginning with the last letter of
         the first letter, or with the first letter of the last
         word, or ending with a rhyming word, or by applying any
         other arbitrary rule may be agreed upon.
         [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "capping":
   a cut above, above, ahead, ascendant, better, chosen, closing,
   concluding, consummating, consummative, consummatory, crowning,
   culminating, culminative, distinguished, eclipsing, eminent,
   ending, exceeding, excellent, excelling, finer, finishing, greater,
   heading, higher, in ascendancy, in the ascendant, major, marked,
   of choice, one up on, outstanding, outtopping, over, overtopping,
   perfecting, perfective, rare, rivaling, super, superior,
   surpassing, terminating, topping, transcendent, transcendental,
   transcending, upper