boarder

noun

• A pupil who lives at school during term time.

  "The student body consisted primarily of boarders, except for a few children belonging to the school staff."

• Someone who pays for meals and lodging in a house rather than a hotel.

  "When I left for college, my parents took on a boarder in my old room to help defray expenses."

• One who boards a vehicle.
• A sailor attacking an enemy ship by boarding her, or one repelling such attempts by an enemy.

  "The captain shouted at the crew to grab arms and repel boarders."

• Someone who takes part in a boardsport, such as surfing or snowboarding.

  "A group of boarders swept past us as we climbed the side of the ski run."