liberal arts vs discipline

liberal arts and discipline both are nouns.

Word	Noun	Adjective	Verb	Adverb
liberal arts	Yes	No	No	No
discipline	Yes	No	Yes	No

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

liberal arts: studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)
discipline: a branch of knowledge

Other hypernyms of liberal arts include bailiwick, field, field of study, study, subject, subject area, subject field.

liberal arts (noun)	discipline (noun)
studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)	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

liberal arts (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