an hero vs swamp water

an hero

noun
  • A suicidee; one who commits suicide. 

verb
  • To commit suicide. 

swamp water

noun
  • Synonym of suicide (“beverage combining all available flavors at a soda fountain”) 

  • Used other than figuratively or idiomatically: see swamp, water. 

How often have the words an hero and swamp water occurred in a corpus of books? (source: Google Ngram Viewer )