congener vs relative

congener

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

  • Any of a group of structurally related compounds. 

  • 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. 

relative

noun
  • Someone in the same family; someone connected by blood, marriage, or adoption. 

  • A type of adjective that inflects like a relative clause, rather than a true adjective, in certain Bantu languages. 

adj
  • Expressed in relation to another item, rather than in complete form. 

  • Having the same key but differing in being major or minor. 

  • Connected to or depending on something else; comparative. 

  • Depending on an antecedent; comparative. 

  • Relevant; pertinent; related. 

  • Capable to be changed by other beings or circumstance; conditional. 

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