Rework – The act of reprocessing non-complying product, through the use of original or alternate equivalent processing, in a manner that assures compliance of the product with applicable drawings or specifications.
Repair – Action on a nonconforming product to make it conform to requirements. Unlike rework, repair can affect or change parts of the nonconforming product.
Simple Example: Fixing of a flat tire, fixing a leak in a tire by putting a plug in the tire, or a patch on the tire is called repairing the tire, it doesn’t look like it did when it was brand new.
On the other hand if the tire was low in pressure and air was added to the tire to bring it back to operational pressure, the act of putting air in the tires is call rework, because once the air is in the tire they will look like all the other tires with no visible sign of any changes in physically appearance.