amalgam vs liquefaction

amalgam

noun
  • A combination of different things. 

  • An alloy containing mercury. 

  • One of the ingredients in an alloy. 

liquefaction

noun
  • The liquid or semiliquid that results from this process. 

  • Process of being, or state of having been, made liquid (from either a solid or a gas) 

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