congener vs congeneric

congener

noun
  • Any of a group of structurally related compounds. 

  • A person or thing similar in behavior or nature to another. 

  • Any of several alcohols, other than ethanol, that are found in fermented and distilled alcoholic drinks, and are partially responsible for their flavour and character. 

  • A plant or animal of the same taxonomic genus as another. 

congeneric

adj
  • Of or pertaining to congeners (organisms of the same genus) 

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