et al. vs etc.

et al.

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

  • And elsewhere; to complete a list of places. 

etc.

phrase
  • And so on: used to note that the rest of a list or piece of information has been left out on the assumption that it is similar or already known. 

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