melting vs thermal

melting

adj
  • Which is melting, dissolving or liquefying. 

  • Given over to strong emotion; tender; aroused; emotional, tearful. 

  • That causes one to melt with emotion; able to make others feel tender and emotional. 

noun
  • The act of softening or mitigating. 

  • The process of changing the state of a substance from solid to liquid by heating it past its melting point. 

thermal

adj
  • Pertaining to heat or temperature. 

  • Caused or brought about by heat. 

  • Having a rough finish by treatment with a blow-torch. 

  • Providing efficient insulation so as to keep the body warm. 

noun
  • A column of rising air in the lower atmosphere created by uneven heating of Earth's surface. 

verb
  • To create a rough finish on stone by treating it with a high-temperature blow-torch. 

  • To fly an unpowered aircraft in a (thermal) column of rising air. 

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