Customer confusion with jargon

I am working with customers in an app that helps them visualize where their products are in the order management process. Recently with some testing I discovered that the users were confused by the status stage titled "Fill Rate". When explored further with users a pattern emerged where I found out that the terms "fill rate" didn't mean anything to them.

I expanded on the issue with users and unfortunately didn't come up with a clear verbiage to properly communicate what this stage is.

Are there any online tools that you'd recommend for surveying additional results?