bonfire vs combustion

bonfire

noun
  • Something like a bonfire (sense 1 or 2) in heat, destructiveness, ferocity, etc. 

  • A large, controlled outdoor fire lit to celebrate something or as a signal. 

  • A fire lit outdoors to burn unwanted items; originally (historical), heretics or other offenders, or banned books; now, generally agricultural or garden waste, or rubbish. 

verb
  • To destroy (something) by, or as if by, burning on a bonfire; (more generally) to burn or set alight. 

  • To fire (pottery) using a bonfire. 

  • To make, or celebrate around, a bonfire. 

combustion

noun
  • The act or process of burning. 

  • A process wherein a fuel is combined with oxygen, usually at high temperature, releasing heat. 

  • A process whereby two chemicals are combined to produce heat. 

  • Violent agitation, tumult. 

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