black coffee vs café au lait

black coffee

noun
  • Coffee served as a beverage without cream or milk. 

café au lait

noun
  • A mixture of coffee and hot milk. 

  • A light coffee colour. 

  • Coffee and hot milk served in separate jugs as a breakfast drink. 

How often have the words black coffee and café au lait occurred in a corpus of books? (source: Google Ngram Viewer )