Supremacy is a related term of importance.
As nouns the difference between supremacy and importance
is that supremacy
is the quality of being supreme while importance
is the quality or condition of being important or worthy of note.
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.
The quality or condition of being important or worthy of note
significance or prominence
personal status or standing