brownie vs imp

brownie

noun
  • A mythical creature, a helpful elf who would secretly do people's housework for them. 

  • A brown trout (Salmo trutta). 

  • A girl in the first level of Girl Guides (US: Girl Scouts). 

  • A small square piece of rich cake, usually made with chocolate. 

  • A household spirit or revered ancestor. 

  • The widow rockfish (Sebastes entomelas), a fish in the family Sebastidae. 

  • Coordinate term: greenie 

  • A person of Arab, Indian or Hispanic descent. Sometimes used for a Native American or Pacific Islander. 

  • A tall, long-necked beer bottle, made from brown coloured glass. 

  • Any of various lycaenid butterflies of the Eurasian genus Miletus. 

imp

noun
  • A small, mischievous sprite or a malevolent supernatural creature, somewhat comparable to a demon but smaller and less powerful, formerly regarded as the child of the devil or a demon (see sense 3.2). 

  • A mischievous child. 

  • A baby Tasmanian devil. 

verb
  • To add to or unite a object with (something) to lengthen the latter out or repair it; to eke out, enlarge, strengthen. 

  • To provide (someone or something) with wings, hence enabling them or it to soar. 

  • To engraft (a feather) on to a broken feather in a bird's wing or tail to repair it; to engraft (feathers) on to a bird, or a bird's wing or tail. 

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