come by vs nab

come by

verb
  • To obtain; to get, especially by chance or involuntarily. 

  • To come near to; to pass; to visit. 

intj
  • A command to a sheepdog to move clockwise around the sheep 

nab

verb
  • To grab or snatch something. 

  • To seize, arrest or take into custody (a criminal or fugitive). 

noun
  • The cock of a gunlock. 

  • The summit of a hill. 

  • The keeper, or box into which the lock is shot. 

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