employ vs exploit

employ

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

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

  • To make busy. 

noun
  • The state of being an employee; employment. 

exploit

verb
  • To use for one’s own advantage. 

  • To forcibly deprive (someone) of something to which she or he has a natural right for one's own benefit. 

noun
  • A program or technique that exploits a vulnerability in other software. 

  • A heroic or extraordinary deed. 

  • An action or technique that takes advantage of the conditions of a video game to gain an advantage, or to disadvantage others. 

  • An achievement. 

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