As nouns the difference between supremacy and reign
is that supremacy
is the quality of being supreme while reign
is the exercise of sovereign power.
As a verb reign is
to exercise sovereign power, or to rule as a monarch.
Other Comparisons: What's the difference?
The quality of being supreme.
Power over all others.
When used with a designation for a particular group, the assertion that the group in question is superior to or should rule over others.
* (l) (obsolete)
The exercise of sovereign power.
- England prospered under Elizabeth I.'s reign .
The period during which a monarch rules.
- Saturn's sons received the threefold reign / Of heaven, of ocean, and deep hell beneath.
The territory or sphere over which a kingdom; empire; realm; dominion, etc. is ruled.
- The reign of Victoria was a long one.
To exercise sovereign power, or to rule as a monarch
- He reigned in an autocratic manner.