One who attends; one who works with or watches over something.
That which accompanies or follows.
A servant or valet.
One who owes a duty or service to another.
Depending on, or owing duty or service to.
Going with; associated; concomitant.
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.