noun (n)

• a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current(noun.event)

  Synonym:
  countercurrent, crosscurrent, rip, tide rip
  

  source: wordnet30
• a strong surface current flowing outwards from a shore(noun.event)

  Synonym:
  rip current
  

  source: wordnet30