riding mower(n = noun.artifact) - a power mower you can ride on;
is a kind of motor mower, power mower

cross-country riding, endurance riding, hand mower, horseback riding, lawn mower, little red riding hood, motor mower, mower, pack riding, power mower, riding, riding bitt, riding boot, riding breeches, riding crop, riding habit, riding horse, riding lamp, riding light, riding master, riding school, trail riding