mentionable vs outstanding

mentionable

adj
  • Important or worthy of note. 

  • Suitable to be openly talked about, or mentioned; not taboo. 

outstanding

adj
  • Exceptionally good; distinguished from others by its superiority. 

  • Projecting outwards. 

  • Prominent or noticeable; standing out from others. 

  • Unresolved; not settled or finished. 

  • Owed as a debt. 

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