flapper (n.)

• aide-memoire
• aquatics
• backstroke
• bathe
• bathing
• breaststroke
• butterfly
• crawl
• cue
• diving
• fin
• flipper
• floating
• hint
• jogger
• memorandum
• natation
• prompt
• prompter
• prompting
• remembrance
• reminder
• sidestroke
• surfboarding
• surfing
• swim
• swimming
• tickler
• wading