conjoin vs sever

conjoin

verb
  • To join together; to unite; to combine. 

  • To combine two sets, conditions, or expressions by a logical AND; to intersect. 

  • To marry. 

  • To unite, to join, to league. 

  • To join as coordinate elements, often with a coordinating conjunction, such as coordinate clauses. 

noun
  • A reassembled bone, stone or ceramic artifact. 

  • One of the words or phrases that are coordinated by a conjunction. 

sever

verb
  • To suffer disjunction; to be parted or separated. 

  • To disconnect; to disunite; to terminate. 

  • To make a separation or distinction; to distinguish. 

  • To cut free. 

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