backbreaker vs oppressive

backbreaker

noun
  • A strenuous and exhausting task, typically involving physical effort. 

oppressive

adj
  • Hot and humid of the weather. 

  • Tyrannical or exercising unjust power. 

  • Burdensome or difficult to bear. 

  • Weighing heavily on the spirit; intense, or overwhelming 

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