noun (n)

• a sodium salt of carbonic acid; used in making soap powders and glass and paper(noun.substance)

  Synonym:
  sal soda, soda ash, sodium carbonate, washing soda
  

  source: wordnet30
• a sweet drink containing carbonated water and flavoring(noun.food)

  Example:
  In New England they call sodas tonics.
  

  Synonym:
  pop, soda pop, soda water, tonic
  

  source: wordnet30
• Sodium oxide or hydroxide.(noun)

  source: webster1913