calcification vs congelation

calcification

noun
  • The process of change into a stony or calcareous substance by the deposition of lime salt; -- normally, as in the formation of bone and of teeth; abnormally, as in calcareous degeneration of tissue. 

congelation

noun
  • The act or process of passing, or causing to pass, from a fluid to a solid state, as by the abstraction of heat; the act or process of freezing. 

  • That which is congealed. 

  • The state of being congealed. 

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