detach vs subjoin

detach

verb
  • To take apart from; to take off. 

  • To separate for a special object or use. 

  • To come off something. 

subjoin

noun
  • A subordinate or secondary join. 

verb
  • To add something to the end; to append or annex 

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