growler vs mutterer

growler

noun
  • A person, creature or thing that growls. 

  • A fish of the perch family, abundant in North American rivers, so named from the sound it emits. 

  • A pork pie. 

  • A small iceberg or ice floe which is barely visible over the surface of the water. 

  • A kind of jug used to carry beer (in current usage, a 2-liter or 64-ounce container with or without a handle; sometimes extended to similarly shaped 32-ounce jug, but not bottles). 

  • A device for checking electrical equipment for short circuits etc. 

  • A horse-drawn cab with four wheels. 

  • The vulva. 

mutterer

noun
  • One who mutters. 

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