stirrup vs strengthener

stirrup

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

  • 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. 

strengthener

noun
  • One who, or that which, gives or adds strength. 

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