collapsar

The term collapsar is sometimes used as a general term for a collapsed star (the stellar remnant, a stellar-mass black hole, possibly also used for a neutron star or less likely, a white dwarfs). This is likely what the term was coined for, but its common current usage is specifically in relation to a hypernova, a model of which was named the collapsar model; the hypernova itself or its result is often called a collapsar. The model also explains some long gamma-ray bursts.