plod vs police

plod

noun
  • the police, police officers 

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

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

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

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

  • To trudge over or through. 

police

noun
  • A department of local (usually municipal) government responsible for general law enforcement. 

  • The staff of such a department or agency, particularly its officers; (regional, chiefly US, Caribbean, Jamaica, Scotland, countable) an individual police officer. 

  • Any of the formally enacted law enforcement agencies at various levels of government. 

  • A branch of the Home Office responsible for general law enforcement within a specific territory. 

  • A public agency charged with enforcing laws and maintaining public order, usually being granted special privileges to do so, particularly 

  • People who try to enforce norms or standards as if granted authority similar to the police. 

  • Cleanup of a military facility, as a formal duty. 

verb
  • To clean up an area. 

  • To enforce norms or standards upon. 

  • To enforce the law and keep order among (a group). 

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