One who or that which helps something to happen.
One who encourages a bad habit in another (typically drug addiction) by their behaviour.
One who gives someone else the power to behave in a certain way.
One who serves another, providing help in some manner.
A person of low condition or spirit.
A person who dedicates themselves to God.
One who is hired to perform regular household or other duties, and receives compensation. As opposed to a slave.