pasturage vs potrero

pasturage

noun
  • A pasture; land that is used for pasture. 

  • The right to graze livestock on a pasture. 

  • The grass or other vegetation eaten by livestock and found in a pasture. 

potrero

noun
  • A long mesa on the flank of a mountain. 

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