noun (n)

• the lowest stone in an arch -- from which it springs(noun.artifact)

  Synonym:
  impost
  

  source: wordnet30
• a cow about to give birth(noun.animal)

  Synonym:
  springing cow
  

  source: wordnet30
• a large spaniel with wavy silky coat usually black or liver and white(noun.animal)

  Synonym:
  springer spaniel
  

  source: wordnet30
• One who, or that which, springs; specifically, one who rouses game.(noun)

  source: webster1913