piton vs spigot

piton

verb
  • To put pitons into a rock/ice to facilitate climbing. 

noun
  • A spike, wedge, or peg that is driven into a rock or ice surface as a support (as for a mountain climber). 

spigot

verb
  • To block with a spigot. 

  • To insert (a spigot). 

noun
  • A water tap: a faucet or sillcock. 

  • The plug of a faucet, tap or cock. 

  • A pin or peg used to stop the vent in a cask. 

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