The term 'snowboard cousin' refers to three winter sports activities: sledding (4 letters), skiing (3 letters) and monoskiing (7 letters). Sledding is a recreational activity that involves riding on a flat surface, usually snow or ice, with the aid of a SLED. Skiing is a popular winter sport in which participants use skis to glide over snow. Monoskiing is a variation of skiing in which the participant uses a single wide SKI instead of two separate skis. All three activities are related to snowboarding, as they involve sliding down a snowy slope.