human resources vs laborer

human resources

noun
  • The personnel department of an organization, dealing with the recruitment, administration, management and training of employees; abbreviated as HR. 

  • The personnel employed in an organization. 

laborer

noun
  • One who uses body strength instead of intellectual power to earn a wage, usually hourly. 

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