plunderage vs spoils

plunderage

noun
  • The embezzlement of goods on shipboard. 

spoils

noun
  • Waste material left over in the course of excavation, construction, mining, or dredging operations. 

  • That which is taken from another by violence; especially, the plunder taken from an enemy; pillage; booty. 

  • Public offices and their benefits regarded as the peculiar property of a successful party or faction, to be bestowed for its own advantage. 

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