noun (n)

• an arm off of a larger body of water (often between rocky headlands)(noun.object)

  Synonym:
  recess
  

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

  Synonym:
  intake
  

  source: wordnet30
• A passage by which an inclosed place may be entered; a place of ingress; entrance.(noun)

  source: webster1913