A lead designer's job is to lead the overall construction of a single project. They can become famous and seen as the creator of a line of product in the eyes of fans.

They are differentiated from leaders, who are not designers, but instead lead the entire team they are on, handling HR and project related tasks.

A design can refer to 2 things:

• The design of product, i.e. what it should do, how it should be constructed, etc. Usually comes in the form of a design document
• Hardware design, which is the final physical look of a piece of hardware

Unless hardware is specifically used, design will refer to the first of these 2, e.g. a description of how a product should work and be constructed.

Projects refer to a product that is being created, but is not yet finished.

A task is a job that usually has a card in the right side of the UI. It can be a contract to create some software, the alpha phase of the player's own project, a lawsuit, etc.

Work items and tasks can be used interchangeably in most cases, but work items refer to the actual UI element, so tasks is more general.