bulldozer vs oppressor

bulldozer

noun
  • A bully; an overbearing individual. 

  • A member of a self-identified group of white US Southerners who colluded to influence outcomes of post-Reconstruction elections by intimidating, coercing and bullying black voters and legislators, including burning down houses and churches, flogging and murdering opponents. 

  • A tractor with an attached blade for pushing earth and building debris for coarse preliminary surface grading, demolishing building structures, etc. 

  • One who bulldozes. 

verb
  • To bulldoze (push through forcefully). 

oppressor

noun
  • Someone who oppresses another or others. 

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