illuminant vs moonbeam

illuminant

noun

  • Something that illuminates. 

adj

  • That illuminates. 

moonbeam

noun

  • A shaft of moonlight. 

  • Moonlight generally. 

  • Any of various Australasian lycaenid butterflies of the genus Philiris. 

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