peculiar vs theirs

peculiar

adj
  • Common or usual for a certain place or circumstance; specific or particular. 

  • Out of the ordinary; odd; strange; unusual. 

noun
  • an ecclesiastical district, parish, chapel or church outside the jurisdiction of the bishop of the diocese in which it is situated. 

  • That which is peculiar; a sole or exclusive property; a prerogative; a characteristic. 

theirs

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

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