How is nomenclatures of some tumros?

Lymphoma, mesothelioma, melanoma, invasive meningioma and seminoma are malignant (not benign) Hamartoma (mass of disorganized tissue acc to site, Hamartochonroma of lungs) Choristoma (anomaly of heterotopic nest of cells, small nodule in pancreatic tissue may be submucosa of stomach, duodenum.