deathwatch vs moth

deathwatch

noun
  • A deathwatch beetle. 

  • One who guards a condemned person before execution. 

  • A vigil beside a dying person 

moth

noun
  • A usually nocturnal insect of the order Lepidoptera, distinguished from butterflies by feather-like antennae. 

  • Anything that gradually and silently eats, consumes, or wastes any other thing. 

  • The plant Vigna aconitifolia, moth bean. 

verb
  • To hunt for moths. 

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