academia vs alma mater

academia

noun
  • Continuous study at higher education institutions; scholarship. 

  • The scientific and cultural community engaged in higher education and research, taken as a whole. 

alma mater

noun
  • A school, college or university from which an individual has graduated or which he or she has attended. 

  • A school's anthem or song. 

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