drub vs thrash

drub

verb
  • To defeat someone soundly; to annihilate or crush. 

  • To beat (someone or something) with a stick. 

  • To forcefully teach something. 

  • To criticize harshly; to excoriate. 

noun
  • Carbonaceous shale; small coal; slate, dross, or rubbish in coal. 

thrash

verb
  • To defeat utterly. 

  • To extensively test a software system, giving a program various inputs and observing the behavior and outputs that result. 

  • In computer architecture, to cause or undergo poor performance of a virtual memory (or paging) system. 

  • To move about wildly or violently; to flail; to labour. 

  • To beat mercilessly. 

  • To thresh. 

noun
  • A beat or blow; the sound of beating. 

  • thrash metal 

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