moot point vs theme

moot point

noun
  • 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. 

  • 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. 

theme

noun
  • A subject, now especially of a talk or an artistic piece; a topic. 

  • The main melody of a piece of music, especially one that is the source of variations. 

  • The stem of a word. 

  • A concept with multiple instantiations. 

  • Topic, what is generally being talked about, as opposed to rheme. 

  • A regional unit of organisation in the Byzantine empire. 

  • thematic relation of a noun phrase to a verb. 

  • Theta role in generative grammar and government and binding theory. 

  • A song, or a snippet of a song, that identifies a film, a TV program, a character, etc. by playing at the appropriate time. 

  • Any of various colors, or color palettes, in which a design is offered; (graphical user interface) any of various skins for an app, affecting the visuals and perhaps other elements such as sound effects. 

verb
  • To give a theme to. 

  • To apply a theme to; to change the visual appearance and/or layout of (software). 

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