discipline vs system of rules

discipline and system of rules both are nouns.

Word	Noun	Adjective	Verb	Adverb
discipline	Yes	No	Yes	No
system of rules	Yes	No	No	No

As nouns, system of rules is a hypernym of discipline; that is, system of rules is a word with a broader meaning than discipline:

Other hypernyms of discipline include system.

discipline (noun)	system of rules (noun)
training to improve strength or self-control	a complex of methods or rules governing behavior
the act of disciplining
the trait of being well behaved
a branch of knowledge
a system of rules of conduct or method of practice

discipline (verb)	system of rules (verb)
punish in order to gain control or enforce obedience
develop (a child's or animal's) behavior by instruction and practice; especially to teach self-control