individual vs theirs

individual

adj
  • Intended for a single person as opposed to more than one person. 

  • Not divisible without losing its identity. 

  • Relating to a single person or thing as opposed to more than one. 

noun
  • An object, be it a thing or an agent, as contrasted to a class. 

  • A person considered alone, rather than as belonging to a group of people. 

  • An element belonging to a population. 

  • A single physical human being as a legal subject, as opposed to a legal person such as a corporation. 

theirs

pron
  • That which belongs to them; the possessive case of they, used without a following noun. 

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