collet vs ferrule

collet

noun
  • A band, flange, ferrule, or collar, designed to grip and hold a tool or a workpiece under proper control, and usually to release it under control thereafter; such a collet usually is made of a hard, springy material, especially a metal. 

  • The rim (of a ring) within which a jewel is set. 

  • In an embryonic plant, the transition zone between the root and the hypocotyl (not clearly distinguishable in most plants.) 

ferrule

noun
  • A band or cap (usually metal) placed around a shaft to reinforce it or to prevent splitting. 

  • The plastic band attaching the tip to the cue. 

  • The pinched metal band which holds the bristles of a paintbrush to the shaft. 

  • The metal spike at the end of the shaft of an ice axe. 

  • A bushing for securing a pipe joint. 

  • A metal sleeve placed inside a gutter at the top. 

verb
  • To equip with a ferrule. 

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