affinity vs sibling

affinity

noun
  • A family relationship through marriage of a relative (e.g. sister-in-law), as opposed to consanguinity (e.g. sister). 

  • A kinsman or kinswoman of a such relationship; one who is affinal. 

  • The attraction between an antibody and an antigen 

  • An automorphism of affine space. 

  • resemblances between biological populations, suggesting that they have a common origin, type or stock. 

  • A love interest; a paramour. 

  • The fact of and manner in which something is related to another. 

  • structural resemblances between minerals; resemblances that suggest that they are of a common origin or type. 

  • An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds 

  • tendency to keep a task running on the same processor in a symmetric multiprocessing operating system to reduce the frequency of cache misses 

  • Any romantic relationship. 

  • Any passionate love for something. 

  • A natural attraction or feeling of kinship to a person or thing. 

sibling

noun
  • A person who shares a parent; one's brother or sister who one shares a parent with. 

  • A node in a data structure that shares its parent with another node. 

  • The most closely related species, or one of several most closely related species when none can be determined to be more closely related. 

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