Gnostic vs gnostical

Gnostic

adj

  • Of, or relating to Gnosticism 

  • Of, or relating to, intellectual or spiritual knowledge 

noun

  • A believer in Gnosticism 

gnostical

adj

  • Synonym of gnostic 

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