hers vs them

hers

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

them

pron
  • Used as the object of a preposition. 

  • Used as the direct object of a verb. 

  • Used as the indirect object of a verb. 

det
  • Those. 

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