in- vs syn-

in-

prefix

  • in, into 

  • Used with certain words to reverse their meaning 

  • in, into, towards, within. 

  • Added to adjectives to mean not 

  • Added to nouns to mean lacking or without 

syn-

prefix

  • concomitant 

  • with, together 

  • identical 

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