alumnus vs collegian

alumnus

noun
  • A student of any gender. 

  • A male pupil or student. 

  • A male graduate. 

  • A graduate of any gender. 

collegian

noun
  • A student (or a former student) of a college 

  • An inmate of a prison. 

adj
  • Of or relating to a college or its students. 

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