akin vs indistinguishable

akin

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

  • Of the same kin; related by blood. 

indistinguishable

adj
  • Not distinguishable; not capable of being perceived, known, or discriminated as separate and distinct 

  • Not capable of being perceived or known. 

noun
  • Any of a set of things that cannot be distinguished. 

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