destructor vs initiator

destructor

noun
  • A furnace or oven for the burning or carbonizing of refuse. 

  • A function that runs when an object is no longer required, used to release any resources that it was using. 

  • One who destructs. 

initiator

noun
  • A substance that initiates a chain reaction or polymerization. 

  • A component of a nuclear weapon that produces a burst of neutrons to trigger a fission chain reaction. 

  • One who initiates. 

  • A task (in a mainframe computer) that initiates multiple jobs. 

  • A material whose presence in the body eventually leads to cancer. 

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