Abs Core
Includes only one muscle group Means a number of muscle groups
Draws rib cage to the pelvis (e.g. during sit-ups or other types of crunches) Takes part in body stabilization, maintaining balancing positions and in many natural physical acts
Fairly dependent on overall physical strength Requires a lot of full-body exercising to get well-developed Source: http://theydiffer.com/difference-between-abs-and-core/