demonstration vs grounds

demonstration

noun
  • The act of demonstrating; showing or explaining something. 

  • A public display of group opinion, such as a protest march. 

  • A proof. 

  • Expression of one's feelings by outward signs. 

  • A prisoner's act of beating up another prisoner. 

  • An event at which something will be demonstrated. 

  • A show of military force. 

grounds

noun
  • Basis or justification for something. 

  • The sediment at the bottom of a liquid, or from which a liquid has been filtered. 

  • The collective land areas that compose a larger area. 

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