Here are some other related terms:
* Kusa - This means "voluntary" or "willingly."
* Nagboboluntaryo - This means "volunteering."
* Boluntaryong trabaho - This means "voluntary work."
The best term to use will depend on the context. For example, if you are talking about someone who is volunteering their time, you could use "boluntaryo" or "nagboboluntaryo." If you are talking about a specific type of volunteer work, you could use "boluntaryong trabaho."