interstice vs rimation

interstice

noun
  • A small opening or space between objects, especially adjacent objects or objects set closely together, as between cords in a rope or components of a multiconductor electrical cable or between atoms in a crystal. 

  • A small interval of time free to be spent on activities other than one's primary goal. 

  • An interval of time required by the Roman Catholic Church between the attainment of different degrees of an order. 

  • A fragment of space. 

rimation

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