subdivide vs sunder

subdivide

verb
  • To divide into smaller sections. 

  • To divide divisions into smaller divisions. 

  • To divide a plot of land into plots for residences; to convert open land into housing. 

sunder

verb
  • To part, separate. 

  • To break or separate or to break apart, especially with force. 

noun
  • a separation into parts; a division or severance 

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