groundskeeping vs landscaping

groundskeeping

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

landscaping

noun
  • The act of improving a landscape. 

  • Improved land (trees, gardens, leveled ground, etc). 

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