harmful vs symbiotic

harmful

adj
  • of a kind likely to be damaging; injurious 

symbiotic

adj
  • Of, or relating to symbiosis; living together. 

  • Of a relationship with mutual benefit between two individuals or organisms. 

noun
  • symbiotic star 

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