gardening vs groundskeeping

gardening

noun
  • The process or action of cultivating the soil, particularly in a garden; the care of a garden; horticulture. 

  • Any process of care, maintenance, or curation, especially digitally. 

  • The act of a batsman prodding at the pitch with his bat, typically in order to flatten any bumps. 

groundskeeping

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

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