Defining a workflow process and map vs process plan

Hi

If my understanding is correct. a lifecycle is the states an item (be it a part, equipment or document) goes through.

The manufacturing process plan is the plan (list of operations and steps) required to realize a part or product.

Then what is the workflow map, process, activity, assignment and task? And can a workflow process not be the same as a manufacturing process plan?

Is there possibly a document that clearly defines these, their relation to one another and to which items they relate to (part, product, document etc.)

Thanks