English to English

noun (n)

• a person who supplies information(noun.person)

  Synonym:
  source
  

  source: wordnet30
• someone who sees an event and reports what happened(noun.person)

  Synonym:
  witness, witnesser
  

  source: wordnet30
• One who, or that which, informs, animates, or vivifies.(noun)

  source: webster1913