agriculturist vs combine harvester

agriculturist

noun
  • One who practices agriculture, a farmer, a gardener. 

  • An expert in agriculture who advises farmers. 

adj
  • Of or pertaining to agriculture or agriculturists. 

combine harvester

noun
  • A combine, a farming machine that harvests, threshes, and cleans grain plants. 

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