bread vs zwieback

bread

noun
  • Any variety of bread. 

  • Money. 

  • Food; sustenance; support of life, in general. 

  • A piece of embroidery; a braid. 

  • A foodstuff made by baking dough made from cereals. 

verb
  • To coat with breadcrumbs. 

  • To make broad; spread. 

  • To form in meshes; net. 

zwieback

noun
  • A usually sweetened bread enriched with eggs that is baked and then sliced and toasted until dry and crisp; considered easy to digest and therefore given to the ill and used as a teething food for toddlers. 

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