malt vs tough

malt

verb
  • To become malt. 

  • To convert a cereal grain into malt by causing it to sprout (by soaking in water) and then halting germination (by drying with hot air) in order to develop enzymes that can break down starches and proteins in the grain. 

noun
  • A milkshake with malted milk powder added for flavor. 

  • Malt liquor, especially malt whisky. 

  • Malted grain (sprouted grain) (usually barley), used in brewing and otherwise. 

  • Maltose-rich sugar derived from malted grain. 

tough

verb
  • To endure. 

  • To toughen. 

intj
  • Used to indicate lack of sympathy 

noun
  • A person who obtains things by force; a thug or bully. 

adj
  • Harsh or severe. 

  • Difficult or demanding. 

  • Stubborn or persistent; capable of stubbornness or persistence. 

  • Strong and resilient; sturdy. 

  • Undergoing plastic deformation before breaking. 

  • Difficult to cut or chew. 

  • Rugged or physically hardy. 

  • Rowdy or rough. 

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