harvester vs mower

harvester

noun
  • A machine that gathers the harvest (harvests the crop). 

  • finnock (a young sea trout) 

  • A North American butterfly, Feniseca tarquinius, whose larvae eat aphids and are the only entirely carnivorous caterpillars in North America 

  • A program or algorithm that gathers data from a source. 

  • A type of heavy forestry vehicle employed in cut-to-length logging for felling, delimbing and bucking trees 

  • Any butterfly of the lycaenid subfamily Miletinae to which this belongs, which are all carnivores. 

mower

noun
  • A farm machine used in hay production (sickle mower, finger-bar mower). 

  • A lawnmower, a machine used to cut grass on lawns. 

  • A person who cuts grass. 

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