enlist vs matriculate

enlist

verb
  • To recruit the aid or membership of others. 

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

  • To secure; to obtain. 

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

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

matriculate

verb
  • To enroll as a member of a body, especially of a college or university 

  • To be enrolled as a member of a body, especially of a college or university. 

noun
  • A person admitted to membership in a society. 

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