in other words vs strictly speaking

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. 

strictly speaking

adv

  • Being totally accurate (used as a phrase to specify). 

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