strider / stridor [ˈstraidɜr]
strider – n. – 1. one who walks or runs with long steps; 2. pond-skater, any insect of the family Gerridae which stands and runs on the surface of water to capture its prey
stridor – n. – a harsh, high-pitched sound, a shrill, creaking noise; 2. Pathology a harsh, vibrating sound produced in the respiratory tract because of obstruction