This is the 2429th most frequent Dutch word.
vrijwillige
"Voluntary."
Here, "vrijwillige" is used as a noun in its plural form "vrijwilligers" which means "volunteers." It refers to individuals who work voluntarily.
De vrijwilligers hebben geholpen bij het opruimen van het park.
The volunteers helped with cleaning the park.
Here, "vrijwillige" is in the form "vrijwilligerswerk," which is a compound noun meaning "volunteer work." It describes the nature of the activity.
Het vrijwilligerswerk biedt veel voldoening.
Volunteer work offers a lot of satisfaction.
Here, "vrijwillige" serves as an adjective meaning "voluntary" to describe the type of decision he made.