contamination vs sterility

contamination

noun
  • A process whereby words with related meanings come to have similar sounds. 

  • The influence of one form (often from a foreign language) on the historical development of another form to which it may be related in meaning. 

  • The act or process of contaminating 

  • Something which contaminates. 

  • The process of making a material or surface unclean or unsuited for its intended purpose, usually by the addition or attachment of undesirable foreign substances. 

sterility

noun
  • The state or quality of being sterile. 

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