mower vs planter

mower

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

  • A person who cuts grass. 

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

planter

noun
  • A machine used for planting seeds. 

  • A box or pot for plants, usually large and standing on the floor. 

  • One who plants something. 

  • Any of the early English or Scottish settlers, given the lands of the dispossessed Irish populace during the reign of Elizabeth I. 

  • The owner of a plantation. 

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