et al. vs et cetera

et al.

phrase
  • And elsewhere; to complete a list of places. 

  • And others; to complete a list, especially of persons, as authors of a published work. 

et cetera

phrase
  • The full form of etc.: and so forth, and the rest. 

noun
  • Something in addition, which can easily be understood. 

How often have the words et al. and et cetera occurred in a corpus of books? (source: Google Ngram Viewer )