What is the difference between 'herniated disk' and 'lumbar radiculopathy'?

Different labels. A disc herniation is a portion of a disc outside its normal confines while a radiculopathy is pain over a nerve path cuaaed by a pinching or compression of that nerve which could include a disc herniation, a cyst, a tumor or mass, a blood clot called a hematoma or spobal strnosis to name a few.