Defects
Overproduction of things not demanded by actual customers
Inventories awaiting further processing or consumption
Unnecessary over-processing (for example, relying on inspections rather than designing the process to eliminate problems)
Unnecessary motion of employees
Unnecessary transport and handling of goods
Waiting for an upstream process to deliver, or for a machine to finish processing, or for a supporting function to be completed, or for an interrupted worker to get back to work...
And a few more types of waste...
Confusion - missing or misinformation. Confusing goals & metrics.
Unsafe or unergonomic work conditions
Underutilized human potential - skills, talents, and creativity
These types of waste are not the direct targets for continuous improvement.
They are symptoms. Your team needs to identify and eliminate the root causes.