IPA: //ˈreɪsˌwɔːkər//
KK: /ˈreɪsˌwɔːkər/
A person who competes in the sport of walking at a fast pace, following specific rules about how to walk.
She is a dedicated racewalker who trains every day for competitions.
Racewalker → It is formed from "race" (from Old French *racier*, meaning to run or compete) and "walker" (from Old English *wealcan*, meaning to move or walk). The word "racewalker" refers to a person who competes in walking races, emphasizing both the competitive aspect and the act of walking.
Think of someone who is 'competing' ('race') while 'walking' ('walker') — that's what a racewalker does.