Someone who causes something is often referred to as a "catalyst" or "instigator." In more specific contexts, they might be called a "perpetrator" (in negative situations) or simply a "cause" or "originator" of an event. The term can vary based on the nature of the action and the context in which it occurs.
A scourger is someone who harasses, punishes or causes destruction.
you call them able?
you call them able?
Pathogen or an anti-body
a souvenir
You can call something that makes something move a "force" or a "mover," while something that causes it to stop can be referred to as a "brake" or a "stopper."
That is asault and you can call the police.
...registration?
slut, whore
An immortal. Deathless.
Imaginative
A name is for someone to call you something. Would you want someone to call you something or say,"Hey........um.....you person over there!"