ostensible vs plausible

ostensible

adj
  • Appearing as such; being such in appearance; professed, supposed (rather than demonstrably true or real). 

  • Apparent, evident; meant for open display. 

plausible

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

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

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