What is the different between pentathlon and decathlon?

The athletics Pentathlon for women consists of five events and shall be held on one day in the following order: 60m Hurdles, High Jump, Shot Put, Long Jump, 800m.

The Pentathlon for junior men consists of five events, which shall be held on one day in the following order: 60m Hurdles, Long Jump, Shot Put, High Jump, 1000m.

The Decathlon is a men's event and consists of four track and six field events held on two consecutive days in this sequence: 100m, long jump, shot, high jump, 400m, 110m hurdles, discus, pole vault, javelin and 1500m. The athlete is allowed three trials in the long jump and throwing events. Placings are determined by the total number of points scored per the IAAF scoring tables.