employ vs replace

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. 

replace

verb
  • To take over the position or role from. 

  • To place again. 

  • To put in a new or different place. 

  • To take the place of; to be used instead of 

  • To restore to a former place, position, condition, etc.; to put back 

  • To refund; to repay; to pay back 

  • To supply or substitute an equivalent for 

  • To demolish (a building) and build an updated form of that building in its place. 

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