akin vs pertinent

akin

adj
  • Allied by nature; similar; partaking of the same properties; of the same kind. 

  • Of the same kin; related by blood. 

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 akin and pertinent occurred in a corpus of books? (source: Google Ngram Viewer )