ligament vs zipper

ligament

noun
  • A band of strong tissue that connects bones to other bones. 

  • That which binds or acts as a ligament. 

zipper

noun
  • A string of clothes pegs or clips attached to the body and then quickly pulled off. 

  • A pressure-sensitive plastic closure. 

  • A leucine zipper. 

  • A zip fastener. 

  • A technique for arbitrarily traversing an aggregate data structure and updating its contents. See zipper (data structure). 

  • A scar on a person's body. 

verb
  • to put a zipper on an article. 

  • to close a zipper. 

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