a person who freely offers to take part in an enterprise or undertake a task
She is a volunteer at the hospital.
He volunteered to help.
They need more volunteers.
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volunteer work
volunteer service
become a volunteer
helper
participant
contributor
worker
Freely offer to do something.
She decided to volunteer at the local shelter.
Many people volunteer their time to help those in need.
He volunteered to lead the team in the charity event.
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volunteer for a cause
volunteer at the shelter
volunteer to help
offer
enlist
contribute