pavement princess vs streetwalker

pavement princess

noun
  • A female prostitute who seeks clients on the street. 

  • A vehicle (pickup truck, ute, or SUV) that has good off-road capabilities (often modified with the installation of large wheels, large tires, or lifted suspensions in order to increase off-road performance or appear more aggressive), but is rarely taken off-road. 

streetwalker

noun
  • A prostitute who looks for customers on the streets and in other public places. 

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