freestyler

noun
  1. a swimmer who competes in freestyle swimming events, typically the front crawl stroke
  2. Usage: sports; common in competitive swimming contexts
  3. a person who performs freestyle skiing or snowboarding, executing tricks and jumps on slopes or in terrain parks
  4. Usage: sports; winter sports
  5. a hip-hop artist or rapper who improvises lyrics without a prepared script
  6. Usage: music; informal

Examples