drub vs worst

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. 

worst

verb
  • To outdo or defeat, especially in battle. 

adj
  • Most unfavorable. 

  • Used with the definite article and an implied noun: something that is worst. 

  • Most inferior; doing the least good. 

  • Most harmful or severe. 

noun
  • Something or someone that is the worst. 

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