in other words vs specially

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. 

specially

adv

  • in particular 

  • For a special purpose, person, or occasion. 

  • extremely 

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