ecological vs sylvan

ecological

adj
  • Relating to ecology, the interrelationships of organisms and their environment. 

  • Not harmful to the environment. 

sylvan

adj
  • Pertaining to the forest, or woodlands. 

  • Residing in a forest or wood. 

  • Wooded, or covered in forest. 

noun
  • A fabled deity of the wood; a faun, a satyr. 

  • One who resides in the woods. 

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