Observantine vs Observantist

Observantine

noun

  • A member of the Observant branch of Franciscan friars. 

adj

  • Of or pertaining to the Observant branch of Franciscan friars 

Observantist

noun

  • Synonym of Observant (“member of Franciscan order”) 

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