dendrology vs forestry

dendrology

noun
  • the study of trees and other woody plants 

forestry

noun
  • The science of planting and growing trees in forests. 

  • A forest-covered area. 

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

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

  • Commercial tree farming. 

  • A tree farm. 

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