notary public vs overseer

notary public

noun
  • An officer who can administer oaths and statutory declarations, witness and authenticate documents and perform certain other acts varying from jurisdiction to jurisdiction. 

overseer

noun
  • An officer responsible for the care of the poor, making out lists of voters and those who had not paid taxes, etc. 

  • The manager of a plantation of slaves. 

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