attrit vs depletion

attrit

noun
  • One who voluntarily or involuntarily leaves a company; a termed employee. 

verb
  • To be reduced in quantity through attrition. 

  • To lose, or to kill, troops by attrition due to sustained firepower. 

  • To engage in attrition; to quit or drop out. 

  • To wear down through attrition, especially mechanical attrition. 

depletion

noun
  • The act of depleting, or the state of being depleted; exhaustion. 

  • The consumption of a resource faster than it can be replenished. 

  • gradual expense or use of natural resources over time. 

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