Can somebody enumerate the acts of indecency?

[Sardar Miyan]

وَاللَّاتِي يَأْتِينَ الْفَاحِشَةَ مِن نِّسَائِكُمْ فَاسْتَشْهِدُوا عَلَيْهِنَّ أَرْبَعَةً مِّنكُمْ فَإِن شَهِدُوا فَأَمْسِكُوهُنَّ فِي الْبُيُوتِ حَتَّىٰ يَتَوَفَّاهُنَّ الْمَوْتُ أَوْ يَجْعَلَ اللَّهُ لَهُنَّ سَبِيلًا

And as for those who are guilty of an indecency from among your women, call to witnesses against them four (witnesses) from among you; then if they bear witness confine them to the houses until death takes them away or Allah opens some way for them.
---------------------------------------------
The act of Zina falls in the category of indecency but indecency is not Zina. I just wanted to know as what kind of woman's acts fall in the category of indecency ? The punishment of lifelong confinement to house is very severe. Thanks