lawn-mower vs mower

lawn-mower

noun

  • A lawnmower. 

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). 

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