benefaction vs widow's mite

benefaction

noun
  • An act of charity; almsgiving. 

  • An act of doing good; a benefit, a blessing. 

widow's mite

noun
  • A very small gift or donation which, however, represents a great sacrifice on the part of the giver. 

  • The lepton coin. 

How often have the words benefaction and widow's mite occurred in a corpus of books? (source: Google Ngram Viewer )