coincident vs dissimilar

coincident

adj
  • Occurring at the same time. 

  • Being in the same location. 

  • Being in accordance, matching. 

noun
  • Either of multiple simultaneous related incidents 

dissimilar

adj
  • Not similar; unalike; different 

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