alumna vs alumnus

alumna

noun
  • A female pupil or student (especially of a university or college). 

  • A female graduate. 

alumnus

noun
  • A student of any gender. 

  • A male pupil or student. 

  • A male graduate. 

  • A graduate of any gender. 

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