Carpool is an action that people commute or travel together in someone's car, making a regular journey to work or school. So "carpooler" refers to a member in a group of passengers who carpool? Does this word exist?

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@hqquan21

A carpool is an agreement that a group of people have to travel together in one person's car on a regular basis, to work or school or something like that. So, a Carpooler could be a word to describe a member of the group.

Yes, totally! I think I have heard people use this word before. It is certainly easy to understand.