brother vs congener

brother

noun
  • Someone who is a peer, whether male or female. 

  • A form of address to a man. 

  • A male fellow member of a religious community, church, trades union etc. 

  • Son of the same parents as another person. 

  • A male having at least one parent in common with another (see half-brother, stepbrother). 

  • Somebody, usually male, connected by a common cause, situation, or affection. 

  • A black male. 

  • Someone who is a kinsman or shares the same patriarch. 

intj
  • Expressing exasperation. 

verb
  • To treat as a brother. 

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. 

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