bituminize vs blacktop

bituminize

verb
  • to treat with bitumen 

blacktop

verb
  • To pave with 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. 

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