exclude vs sever

exclude

verb
  • To expel; to put out. 

  • To omit from consideration. 

  • To bar (someone or something) from entering; to keep out. 

  • To refuse to accept (evidence) as valid. 

  • To eliminate from diagnostic consideration. 

sever

verb
  • To disconnect; to disunite; to terminate. 

  • To make a separation or distinction; to distinguish. 

  • To cut free. 

  • To suffer disjunction; to be parted or separated. 

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