A volunteer is a person who performs a service without being paid.
A person who works for free is a volunteer.
a volunteer propono
idiot duffer
'Pro Bono ' work.
An intern or a slave.
splooge
A volunteer
Tech Person
a slave
Employee
someone who works for a business
A mathematician
moofer
An employee.
Landscaper
A vulcanologist.
keelman
An astronomer.
A BarMan