rusk vs strudel

rusk

noun
  • a rectangular, hard, dry biscuit 

  • a twice-baked bread, slices of bread baked until they are hard and crisp (also called a zwieback) 

  • a cereal binder used in meat product manufacture 

  • a weaning food for children 

strudel

noun
  • A pastry made from multiple thin layers of dough rolled up and filled with fruit, etc. 

  • Synonym of at sign (@) 

  • A vertical hole in sea ice through which downward jet-like, buoyancy-driven drainage of flood water is thought to occur. 

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