affine vs kin

affine

noun
  • A relative by marriage. 

verb
  • To refine. 

adj
  • Of or pertaining to a function expressible as f(⃑x)=A⃑x+⃑b (where A is a linear transformation and ⃑b is a constant), which, regarded as a transformation, maps parallel lines to parallel lines and finite points to finite points. 

  • Assigning finite values to finite quantities. 

  • Of two materials, having mutual affinity. 

kin

noun
  • Persons of the same race or family; kindred. 

  • Relationship; same-bloodedness or affinity; near connection or alliance, as of those having common descent. 

  • Race; family; breed; kind. 

  • One or more relatives, such as siblings or cousins, taken collectively. 

  • A fictional character who one deeply relates to. 

  • Someone who relates deeply to a certain fictional character. 

verb
  • To identify with; as in empathize or emotionally relate to a fictional character. 

adj
  • Related by blood or marriage, akin. Generally used in "kin to". 

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