dump truck vs dumper

dump truck

noun
  • A heavy truck, for carrying loose, bulk cargo, having a hinged bed that allows the contents to be unloaded onto the ground. 

  • A large pair of buttocks. 

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 dump truck and dumper occurred in a corpus of books? (source: Google Ngram Viewer )