riser vs stirrup

riser

noun
  • A strip of webbing joining a parachute's harness to the rigging lines. 

  • a reservoir built into a metal casting mold to prevent the formation of cavities in the casting as the metal shrinks on cooling. 

  • A platform or stand used to lift or elevate something. 

  • A Manx cat with a showable short tail. 

  • A pipe connecting an individual exhaust port of an internal combustion engine to the muffler, particularly on aircraft. 

  • A vertical utility conduit, pipe or path between floors of a building for placement of cables (e.g. telephone, networking), or to convey fluids (e.g. gas, water). 

  • Someone or something which rises. 

  • The main body of a bow. 

  • The vertical part of a step on a staircase. 

stirrup

noun
  • A rope secured to a yard, with a thimble in its lower end for supporting a footrope. 

  • Any piece shaped like the stirrup of a saddle, used as a support, clamp, etc. 

  • A portable, flexible ladder-like device used in climbing. 

  • A ring or hoop suspended by a rope or strap from the saddle, for a horseman's foot while mounting or riding. 

  • A stapes. 

adj
  • Referring to women's pants/trousers: being of a form, commonly worn by women, that includes a strap beneath the arch of the foot. 

How often have the words riser and stirrup occurred in a corpus of books? (source: Google Ngram Viewer )