blacktop vs macadam

blacktop

noun
  • Asphalt concrete or similar bituminous black paving material used for the surface of roads (e.g., tarmacadam, tarmac). 

  • A paved area on a schoolground reserved for recess activities, often doubling as a parking lot. 

  • A road so paved. 

verb
  • To pave with blacktop. 

macadam

noun
  • The surface of a road consisting of layers of crushed stone (usually tar-coated for modern traffic). 

verb
  • To cover or surface with macadam. 

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