Wiktionary
nonswimmer
n. One who is not a swimmer, who does not or cannot swim.
Usage examples of "nonswimmer".
In the swimming pool the water was clean and blue, flanked by high white lifeguard perches, broken by wooden buoys that bobbed on a twist of thick rope that had been strung from one side to the other between the deep end and the shallow waters where the babies and nonswimmers could safely splash.
Rather than riding the log, they used it as a float to help these nonswimmers swim.