Ghusl becomes obligatory for seven causes, and the ghusl for each of these different causes has different names:

Ghusl Janabat is ghusl performed after sexual intercourse or ejaculation.
Ghusl Hayd is following menstruation.
Ghusl Nifas is following lochia.
Ghusl Mayyit is ghusl performed on a dead Muslim.

In some denominations, two further categories obligate ghusl:

Ghusl Istihada is for irregular bleeding (in women).
Ghusl Mas-hil Mayyit becomes obligatory if one directly touches a dead body.
Ghusl also becomes obligatory following a vow or oath to perform it.