forestry vs silviculture

forestry

noun
  • The art and practice of planting and growing trees in forests. 

  • A forest-covered area. 

  • The art and practice of cultivating, exploiting and renewing forests for commercial purposes. 

  • Commercial tree farming. 

  • A tree farm. 

  • The science of planting and growing trees in forests. 

silviculture

noun
  • The care and development of forests in order to obtain a product or provide a benefit; forestry. 

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