luminous vs neon

luminous

adj
  • Emitting light; glowing brightly; shining. 

  • Brightly illuminated. 

  • Clear; enlightening; easy to understand. 

neon

adj
  • That resembles a neon light; extremely bright; fluorescent 

noun
  • The chemical element (symbol Ne) with an atomic number of 10. The second of the noble gases, it is a colourless, odorless inert gas. 

  • Neon signs or lights, collectively. 

  • A neon tetra fish. 

  • A form or sample of the element. 

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