
Swimmer
Competitive Connotation
Often implies participation in sports and competition, either at an amateur or professional level.
She trained for years to become a competitive swimmer.
Leisure Activity
May refer to someone swimming for relaxation or pleasure, not just training or competing.
During his holiday, he became a daily swimmer at the resort pool.
Skill Level
Can be used regardless of how good someone is at swimming.
Even though she's just a beginner, she's a dedicated swimmer.