rider
nounUK /ˈraɪdə/
US /ˈraɪdər/
A rider is a person who rides a horse, bike, or motorcycle.
The rider put on her helmet before getting on the bike.
OTHER MEANINGS
2. An extra part added to an official document or law.
The contract had a rider about working hours.
3. A person who travels in a vehicle, such as a bus or train.
The bus rider found a seat near the window.
4. A small piece of text added to a bill or rule to change it.
Lawmakers added a rider to the new budget bill.