groundskeeping vs harvesting

groundskeeping

noun
  • The activity of tending an area of land for aesthetic or functional purposes; typically as an employee of a person or institution 

harvesting

noun
  • The gathering of a mature crop; a harvest. 

  • The gathering of any resource. 

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