Overall course. There are many differences between benign and malignant tumors. A benign tumor is often well differentiated, looks almost normal, and does not spread. A malignant lesion is usually poorly differentiated, ominous looking, and spreads to other sites by blood, lymphatics, and directly. It has a very bad course, and results many times in death unless aggressive treatment is done.
Cancer. Lipoma is a bening tumor (no effect on mortality. You cannot die from it). Colon-testicular cancers are malignant cancers (you may survive and get cured, or you could die from it).