noun (n)

• the process of taking food into the body through the mouth (as by eating)(noun.act)

  Synonym:
  consumption, ingestion, uptake
  

  source: wordnet30
• an opening through which fluid is admitted to a tube or container(noun.artifact)

  Synonym:
  inlet
  

  source: wordnet30
• the act of inhaling; the drawing in of air (or other gases) as in breathing(noun.act)

  Synonym:
  aspiration, breathing in, inhalation, inspiration
  

  source: wordnet30
• The place where water or air is taken into a pipe or conduit; -- opposed to outlet.(noun)

  source: webster1913