moth vs wet blanket

moth

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

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

  • The plant Vigna aconitifolia, moth bean. 

verb
  • To hunt for moths. 

wet blanket

noun
  • A person who takes the fun out of a situation or activity, as by pessimism, demands, dullness, etc. 

  • A timid person; one who lacks confidence; a wimp. 

  • Used other than figuratively or idiomatically: see wet, blanket. 

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