Swimmer
Definition 1 of 2
Pro Tip 1/3
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.
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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.
Pro Tip 3/3
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.