Passenger
Part of speech: noun
Definition: One who rides in a vehicle but is not the driver or part of the operating crew. A young hunting bird that can fly and is taken while it is still in its first year.
Rider
Part of speech: noun
Definition: one who rides, often a horse or motorcyclea provision annexed to a bill under the consideration of a legislature, having little connection with the subject matter of the billan amendment or addition to an entertainer's performance contract, often covering a performer's equipment or food, drinks, and general comfort requirementsA small, sliding piece of aluminium on a chemical balance, used to determine small weights