The noun CAR POOL means a group of people who regularly share a car when they are going to and from their jobs or who take turns driving each other’s children to school, activities, etc.
With the car pool we managed to save some time and money.
His daughter was in my car pool so I had many opportunities to talk to her.
The verb that derives from CAR POOL is TO CARPOOL, pronounced /ˈkɑɚˌpuːl/:
When people began to carpool, some bus drivers lost their jobs.
Tom carpools to work with his friends who live on the same street.
A person who carpools is a CARPOOLER.
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