germane vs pertinent

germane

adj
  • Related to a topic of discussion or consideration. 

noun
  • Any organic derivative of this compound. 

  • germanium tetrahydride, GeH₄ 

pertinent

adj
  • Important with regard to (a subject or matter); pertaining; relevant. 

noun
  • A right that attaches to land, in Scots law. 

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