An allocator is a person who allocates something to someone, or a condition by which something is allocated to someone.
An allocation is a process or procedure of allocating things, especially money or resources.
An allocability is the extent to which something can be allocated, or the condition of something being able to be allocated to someone.
Allocation is handing out or dealing out, such as when you distribute something among other individuals (such as tasks).
An allocator is a person who is allocating, or handing out portions of something to another.