Sales pipeline and sales funnel are used to correspondingly, although they don’t mean the same.
A sales pipeline specify as a sequence of actions that need to be taken before the prospects can progress along the sales process. Once the prospect has fulfilled the stage’s requirement, they can move toward the next step in the pipeline.
On the other way, sales funnel is a marketing concept that shows the buyer’s journey that they will walk through for the entire purchasing process. The reason why it’s known as a sales funnel is that the number of prospects declines from the top-end of the sales process, similar to the shape of a funnel.