Backlog and Source

Backlog noun - An accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services).

Source and backlog are semantically related. In some cases you can use "Source" instead a noun "Backlog".

Source noun - A point or place at which something is invented or provided.

Backlog and source are semantically related. Sometimes you can use "Backlog" instead a noun "Source".