employ vs expel

employ

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

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

  • To make busy. 

noun
  • The state of being an employee; employment. 

expel

verb
  • To eject or erupt. 

  • To remove from membership. 

  • To deport. 

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