Rigorousness and Self-discipline

Rigorousness noun - The quality or state of being demanding or unyielding (as in discipline or criticism).

Self-discipline and rigorousness are semantically related. In some cases you can use "Self-discipline" instead a noun "Rigorousness".

Self-discipline noun - The power to control one's actions, impulses, or emotions.

Rigorousness and self-discipline are semantically related. Sometimes you can use "Rigorousness" instead a noun phrase "Self-discipline".