credible vs plausible

credible

adj
  • Believable or plausible. 

  • Authentic or convincing. 

  • Dependable or reliable. 

plausible

adj
  • Seemingly or apparently valid, likely, or acceptable; conceivably true or likely. 

  • Obtaining approbation; specifically pleasing; apparently right; specious. 

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