-er/-or: These suffixes often indicate someone who performs an action. For example:
* Passenger: Someone who travels in a vehicle.
* Traveller: Someone who travels, often for pleasure.
* Commuters: People who travel regularly between home and work.
-ee: This suffix often indicates someone who is the recipient of an action. For example:
* Employee: Someone who is employed by another.
* Refugee: Someone who is fleeing a dangerous situation.
* Trustee: Someone who holds assets in trust for another.
-ant: This suffix can also indicate someone who performs an action. For example:
* Applicant: Someone who applies for something.
* Servant: Someone who serves another.
* Participant: Someone who takes part in an activity.
Note: While there's no single suffix for "passenger," the context of a word often makes it clear that it refers to someone who travels in a vehicle.