hinder vs unbar

hinder

verb
  • To delay or impede; to keep back, to prevent. 

  • To make difficult to accomplish; to act as an obstacle; to frustrate. 

noun
  • The buttocks. 

adj
  • Of or belonging to that part or end which is in the rear or hind, or which follows. 

unbar

verb
  • To remove an impediment that obstructs the passage of (someone or something). 

  • To remove a prohibition. 

  • To unlock or unbolt a door that had been locked or bolted with a bar. 

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