Hwjchim = Powers given by earthly authority, public office, clan leadership, etc.
Fwjchim = Powers given by divinity, influence, charisma, etc.
Huab tais = earthly king
Fuab tais = divine king (aka God)
Huab = lower clouds (fog)
Fuab = upper clouds (the ones in the sky)
The difference between the two is often not mentioned because some people can't hear the difference between the f and the h.