employ vs exploitation

employ

noun
  • The state of being an employee; employment. 

verb
  • To hire (somebody for work or a job). 

  • To use (somebody for a job, or something for a task). 

  • To make busy. 

exploitation

noun
  • The act of utilizing something; industry. 

  • The act or result of forcibly depriving someone of something to which they have a natural right. 

  • The improper use of something for selfish purposes. 

  • The marketing and promotion of a film. 

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