plausible vs satisfactory

plausible

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

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

satisfactory

adj
  • Causing satisfaction; agreeable or pleasant; satisfying. 

  • Done to satisfaction; adequate or sufficient. 

  • Making atonement for a sin; expiatory. 

noun
  • The rating given to somebody or something that meets requirements without exceeding them. 

  • Somebody or something that meets requirements without exceeding them. 

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