What is the difference between madhy, maniy, wady, and hady, and which of them invalidates ghusl?

The previous fatwa mentioned the differences between madhy (pre-seminal fluid), wady (thick white discharge), and maniy (seminal fluid), and the rulings associated with each. The emission of madhy and wady does not necessitate ghusl (ritual bath for major impurity) nor does it invalidate ghusl if emitted during it. As for maniy, it necessitates ghusl, and its emission during ghusl invalidates it. Regarding al-hādy, which is a fluid discharged by a pregnant woman near childbirth, it is impure (najis) and nullifies wudu' (ablution), but it does not necessitate ghusl, nor does its emission during ghusl invalidate it. The jurists have agreed upon its impurity and its nullification of wudu' because it exits from the two private parts.