employ vs leave alone

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. 

leave alone

verb
  • To stop bothering (a person). 

  • To desist or refrain from involvement with. 

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