striction vs stricture

striction

noun
  • The act of constricting, or the state of being constricted. 

stricture

noun
  • A general state of restrictiveness on behavior, action, or ideology. 

  • The degree of contact, in consonants. 

  • Abnormal narrowing of a canal or duct in the body. 

  • A rule restricting behaviour or action. 

  • A sternly critical remark or review. 

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