fibula vs hook and eye

fibula

noun
  • An ancient kind of brooch used to hold clothing together, similar in function to the modern safety pin. 

  • The smaller of the two bones in the lower leg. 

hook and eye

noun
  • A matched hook and an eye (loop into which the hook can fit), used for fastening. 

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