articulated lorry vs dumper

articulated lorry

noun
  • A tractor-trailer or big rig, consisting of a semi-trailer and a semitruck pulling it; in American English referred to as semi-trailer truck or 18-wheeler. 

dumper

noun
  • A small vehicle often used to carry loads and material around, often on building sites. 

  • One who dumps a boyfriend or girlfriend; the one of a romantic couple who terminates the relationship. 

  • A wave that knocks a surfer into the water. 

  • A program that outputs the contents of storage or a data structure. 

  • A dropper of refuse, particularly not in landfill sites/recycling sites. 

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