English to English

noun (n)

• someone who is the first to think of or make something(noun.person)

  Synonym:
  artificer, inventor
  

  source: wordnet30
• someone who is the first to observe something(noun.person)

  Synonym:
  finder, spotter
  

  source: wordnet30
• One who discovers; one who first comes to the knowledge of something; one who discovers an unknown country, or a new principle, truth, or fact.(noun)

  source: webster1913