ferrule vs ingot

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. 

ingot

noun
  • A solid block of more or less pure metal, often but not necessarily bricklike in shape and trapezoidal in cross-section, the result of pouring out and cooling molten metal, often immediately after smelting from raw ore or alloying from constituents. 

verb
  • To form (scraps of metal) into ingots. 

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