rare vs worst

rare

adj
  • Thin; of low density. 

  • Very uncommon; scarce. 

  • Particularly of meat, especially beefsteak: cooked very lightly, so the meat is still red. 

  • Good; enjoyable. 

verb
  • To rear, bring up, raise. 

  • To rear, rise up, start backwards. 

noun
  • A scarce or uncommon item. 

worst

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. 

verb
  • To outdo or defeat, especially in battle. 

noun
  • Something or someone that is the worst. 

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