copula vs suture

copula

noun
  • A device that connects two or more keyboards of an organ. 

  • A word, usually a verb, used to link the subject of a sentence with a predicate (usually a subject complement or an adverbial), that unites or associates the subject with the predicate. 

  • A function that represents the association between two or more variables, independent of the individual marginal distributions of the variables. 

  • The act of copulation; mating. 

suture

noun
  • A type of fibrous joint bound together by Sharpey's fibres which only occurs in the skull. 

  • Thread used to sew or stitch two edges (especially of skin) together. 

  • An area where separate terrane join together along a major fault. 

  • A seam formed by sewing two edges together, especially to join pieces of skin in surgically treating a wound. 

  • A seam or line, such as that between the segments of a crustacean, between the whorls of a univalve shell, or where the elytra of a beetle meet. 

  • The seam at the union of two margins in a plant. 

verb
  • To sew up or join by means of a suture. 

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