subject field vs discipline

subject field and discipline both are nouns.

Word	Noun	Adjective	Verb	Adverb
subject field	Yes	No	No	No
discipline	Yes	No	Yes	No

As nouns, subject field and discipline are synonyms defined as:

Other synonyms of subject field include bailiwick, field, field of study, study, subject, subject area.

subject field (noun)	discipline (noun)
a branch of knowledge	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

subject field (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