forester vs tree farmer

forester

noun
  • A moth in the family Zygaenidae. 

  • Any of various nymphalid butterflies of the genus Lethe. Other members of this genus are called tree browns and wood browns. 

  • A person who practices forestry. 

tree farmer

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