hoof vs plod

hoof

verb
  • To walk. 

  • To trample with hooves. 

  • To dance, especially as a professional. 

  • To kick, especially to kick a football a long way downfield with little accuracy. 

noun
  • The tip of a toe of an ungulate such as a horse, ox or deer, strengthened by a thick keratin covering. 

  • The human foot. 

plod

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. 

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 hoof and plod occurred in a corpus of books? (source: Google Ngram Viewer )