heir vs heritability

heir

noun
  • Someone who inherits, or is designated to inherit, the property of another. 

  • A successor in a role, representing continuity with the predecessor. 

  • One who inherits, or has been designated to inherit, a hereditary title or office. 

verb
  • To inherit. 

heritability

noun
  • The condition of being inheritable 

  • The ratio of the genetic variance of a population to its phenotypic variance; i.e. the proportion of variability that is genetic in origin 

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