The Collaborative International Dictionary of English v.0.48:

Runway \Run"way`\, n.
   1. The channel of a stream.
      [1913 Webster]

   2. The beaten path made by deer or other animals in passing
      to and from their feeding grounds.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

catwalk \catwalk\ n.
   1. A narrow walkway projecting from a stage into the seating
      area of a theater; it is used, e. g. by models displaying
      clothes on it at a fashion show. Called also runway.
      [WordNet 1.5 +PJC]

   2. A narrow walkway high in the air to allow workers access
      to parts of a structure otherwise difficult to reach.
      Catwalks are located, e.g. above a stage in a theater,
      between parts of a building, along the side of a bridge,
      on the outside of a railroad car, on the outside of a
      large storage tank, etc.
      [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

runway
    n 1: a bar or pair of parallel bars of rolled steel making the
         railway along which railroad cars or other vehicles can
         roll [syn: track, rail, rails, runway]
    2: a chute down which logs can slide
    3: a narrow platform extending from the stage into the audience
       in a theater or nightclub etc.
    4: a strip of level paved surface where planes can take off and
       land

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "runway":
   airstrip, alameda, apron, beaten path, beaten track, berm,
   bicycle path, boardwalk, bridle path, catwalk, clearway, esplanade,
   fairway, fastwalk, flight deck, foot pavement, footpath, footway,
   garden path, groove, hiking trail, landing deck, landing strip,
   mall, parade, path, pathway, prado, promenade, public walk, run,
   rut, sidewalk, strip, towing path, towpath, track, trail, trottoir,
   walk, walkway