ordain vs swear in

ordain

verb
  • To decree. 

  • To prearrange unalterably. 

  • To predestine. 

  • To admit into the ministry, for example as a priest, bishop, minister or Buddhist monk, or to authorize as a rabbi. 

swear in

verb
  • To administer an oath to, as an oath of office or of citizenship. 

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