left-hander vs southpaw

left-hander

noun
  • One who is left-handed. 

  • A bend or turn to the left; a left-hand corner. 

  • A blow struck with the left hand. 

southpaw

noun
  • One who is left-handed, especially in sports. 

  • A boxer who leads with the right hand and guards with the left 

  • A left-handed pitcher. 

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