grist for the gossip mill vs moot point

grist for the gossip mill

moot point

noun
  • An issue that is subject to, or open for, discussion or debate, to which no satisfactory answer is found; originally, one to be definitively determined by an assembly of the people. 

  • An issue regarded as potentially debatable, but no longer practically applicable. Although the idea may still be worth debating and exploring academically, and such discussion may be useful for addressing similar issues in the future, the idea has been rendered irrelevant for the present issue. 

How often have the words grist for the gossip mill and moot point occurred in a corpus of books? (source: Google Ngram Viewer )