calcification vs induration

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. 

induration

noun
  • The process of the strengthening of rocks by heating, compaction or cementation, or a combination thereof. 

  • Hardness. 

  • The quality of non-friability; the extent to which a rock does not crumble; rock strength. 

  • An area or part of the body that has undergone such a reaction. Most often this term is used to describe dermatologic findings. 

  • Process of becoming hard. 

  • Hardening of an area of the body as a reaction to inflammation, hyperemia, or neoplastic infiltration. 

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