in other words vs viz.

in other words

adv

  • used to introduce an explanation, simplification, or clarification 

prep

  • Stated or interpreted another way; Used to introduce an explanation, simplification, or clarification. 

viz.

adv

  • Videlicet: namely, to wit, that is to say, specifically, as an illustration. 

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