systems theory vs discipline

systems theory and discipline both are nouns.

Word	Noun	Adjective	Verb	Adverb
systems theory	Yes	No	No	No
discipline	Yes	No	Yes	No

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

systems theory: the interdisciplinary study of systems in general, with the goal of elucidating principles that can be applied to all types of systems at all nesting levels in all fields of research.
discipline: a branch of knowledge

Other hypernyms of systems theory include bailiwick, field, field of study, study, subject, subject area, subject field.

systems theory (noun)	discipline (noun)
the interdisciplinary study of systems in general, with the goal of elucidating principles that can be applied to all types of systems at all nesting levels in all fields of research.	training to improve strength or self-control
	the act of disciplining
	the trait of being well behaved
	a branch of knowledge
	a system of rules of conduct or method of practice

systems theory (verb)	discipline (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