hire vs retain

hire

verb
  • To accomplish by paying for services. 

  • To occupy premises in exchange for rent. 

  • To employ; to obtain the services of (a person) in exchange for remuneration; to give someone a job. 

  • To accept employment. 

  • To obtain the services of in return for fixed payment. 

  • To exchange the services of for remuneration. 

  • (neologism) (in the Jobs-to-be-Done Theory) To buy something in order for it to perform a function, to do a job 

noun
  • Payment for the temporary use of something. 

  • A person who has been hired, especially in a cohort. 

  • The state of being hired, or having a job; employment. 

retain

verb
  • To keep in one's pay or service. 

  • To employ by paying a retainer. 

  • To hold back (a pupil) instead of allowing them to advance to the next class or year. 

  • To keep in possession or use. 

  • To hold secure. 

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