busk vs plod

busk

verb
  • To tack, cruise about. 

  • To solicit money by entertaining the public in the street or in public transport. 

noun
  • A strip of metal, whalebone, wood, or other material, worn in the front of a corset to stiffen it. 

  • A corset. 

plod

verb
  • To trudge over or through. 

  • To walk or move slowly and heavily or laboriously (+ on, through, over). 

  • To toil; to drudge; especially, to study laboriously and patiently. 

noun
  • A slow or labored walk or other motion or activity. 

  • the police, police officers 

  • a police officer, especially a low-ranking one. 

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