obtain vs procure

obtain

verb
  • To get hold of; to gain possession of, to procure; to acquire, in any way. 

procure

verb
  • To acquire or obtain. 

  • To obtain a person as a prostitute for somebody else. 

  • To induce or persuade someone to do something. 

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