sovereign
As noun, a supreme ruler (often a monarch); adj., possessing supreme or ultimate power; acting or done independently or without outside interference. All of these meanings are relevant to the usages of the term in this text.
chaff
The husks of corn or wheat, which must be separated from the grain through winnowing or threshing—used metaphorically to refer to useless, worthless, insubstantial things, as in the idiom "separate the wheat from the chaff"
subdue
Overcome, bring under control, defeat, capture
stubble
In context, the useless nubs of over-grazed grass
rebuke
As verb, the act of expressing sharp disapproval of someone because of their behavior or actions ;or as noun, such an expression of disapproval: "a rebuke"
cumbreth
Archaic, meaning to impede, hinder, or obstruct; related to the more common "encumber"
sodom
A town in ancient Palestine, believed to have been south of the Dead Sea. According to Genesis, it was destroyed by fire from heaven, together with the city of Gomorrah, for the wickedness of its inhabitants; used generally to refer to a wicked or depraved place.
liable
Likely or prone to do something
Whet
To sharpen, from "whetstone," a kind of stone used to sharpen blades
reign
To rule over, hold office or dominion over, or a period of such ruling
enmity
The state or feeling of disliking or being actively hostile or opposed to someone or something
threshing floor
An area in which, through "threshing," the useful parts of wheat or corn was separated from the useless husks, called "chaff"
waxing
In this context, to become larger or stronger
omnipotent
All-powerful
potentate
Monarch or ruler, especially an autocratic one
unregenerate
Somewhat dated, meaning not reforming or not showing repentance for bad deeds
Sabbath
A day of religious observance or abstinence; for most Christians, Sunday
Zion
Most pertinently, in Christian thought, the heavenly city or city of heaven.