bitumen vs tarmac

bitumen

noun
  • Roads sealed with bitumen, as opposed to dirt roads. 

  • Any one of the natural hydrocarbons, including the hard, solid, brittle varieties called asphalt, the semisolid maltha and mineral tars, the oily petrolea, and even the light, volatile naphthas. 

  • A sticky, black, highly viscous liquid or semi-solid form of petroleum, burning with a bright flame. It occurs as an abundant natural product in many places, as on the shores of the Dead and Caspian Seas. It is used in cements, in the construction of pavements, etc.; Mineral pitch. 

  • Canadian deposits of extremely heavy crude oil. 

verb
  • To cover or fill with bitumen. 

tarmac

noun
  • Any bituminous road surfacing material. 

  • The area of an airport, other than the runway, where planes park or maneuver. 

  • The driveable surface of a road. 

  • Tarmacadam. 

verb
  • To pave with tarmacadam or a similar material. 

  • To spend time idling on a runway, usually waiting for takeoff clearance. 

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