aerator vs appliance

aerator

noun
  • A device which mixes air with a substance, particularly soil or a liquid. 

  • A fumigator used to bleach grain, destroying fungi and insects. 

  • A device used for charging mineral waters with gas and in making soda water. 

appliance

noun
  • A non-manual apparatus or device, powered electrically or by another small motor, used in homes to perform domestic functions (household appliance) and/or in offices. 

  • An attachment, a piece of equipment to adapt another tool or machine to a specific purpose. 

  • An implement, an instrument or apparatus designed (or at least used) as a means to a specific end, especially 

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