excretion vs ingestion

excretion

noun
  • Something excreted in that manner, especially urine or feces. 

  • The process of removing or ejecting material that has no further utility, especially from the body; the act of excreting. 

ingestion

noun
  • The act of ingesting something into a jet engine. 

  • The action of ingesting, or consuming something orally, whether it be food, drink, medicine, or other substance. It is usually referred to as the first step of digestion. 

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