extensional vs germane

extensional

adj
  • Of or pertaining to extension. 

  • Having great extent. 

germane

adj
  • Related to a topic of discussion or consideration. 

noun
  • Any organic derivative of this compound. 

  • germanium tetrahydride, GeH₄ 

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