immolation vs widow's mite

immolation

noun
  • That which is immolated; a sacrifice. 

  • The act of immolating, or the state of being immolated, or sacrificed. 

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 immolation and widow's mite occurred in a corpus of books? (source: Google Ngram Viewer )