Compact objects refer to astronomical objects that have high densities and small sizes. There are various synonyms for the term "compact object," including dense objects, compact stars, and neutron stars. These objects are known for their unique properties, including strong gravity, intense magnetic fields, and fast rotation. Some other synonyms for compact objects include white dwarfs, black holes, and pulsars, which are all different types of these astronomical objects. These objects are typically formed from the remnants of a massive star that has undergone a supernova explosion. In the field of astrophysics, understanding these objects is crucial to gaining insights into the universe's structure and evolution.