employ vs helper

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. 

helper

noun
  • A person who does cleaning and cooking in a family home, or in a market; domestic employee. 

  • That which helps; anything serving to assist. 

  • One who helps; an aide; assistant; auxiliary. 

  • A locomotive that assists a train, usually on steep gradients. 

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