enlist vs induct

enlist

verb
  • To voluntarily join a cause or organization, especially military service. 

  • To recruit the aid or membership of others. 

  • To enter on a list; to enroll; to register. 

  • To secure; to obtain. 

noun
  • One who is enlisted, usually in a military service. 

induct

verb
  • To draft into military service. 

  • To formally or ceremoniously install in an office, position, etc. 

  • To introduce into (particularly if certain knowledge or experience is required, such as ritual adulthood or cults). 

  • To bring in as a member; to make a part of. 

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