Difference

https://www.caclubindia.com/experts/what-is-difference-between-circular-and-notification-465535.asp

Rules can be described as the guidelines or instructions of doing something correctly. these are the principles that govern the conduct or behavior or a person in an organization or country. On the other hand, regulations refer to the directives or statute enforced by law, prevailing in the country.

The primary difference between rules and regulation is that while the former do not as such have a legal binding, the latter have a legal binding. As these two terms are used in the same breath, people do not recognize their differences. These are of utmost importance in that rules and regulations are present everywhere, i.e. school, college, office, club, corporations, banks etc., as they are helpful in maintaining law and order in the concerned place.

And a minor change or addition designed to improve a text, piece of legislation, etc is amendment

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