field of study vs discipline

field of study and discipline both are nouns.

Word	Noun	Adjective	Verb	Adverb
field of study	Yes	No	No	No
discipline	Yes	No	Yes	No

As nouns, field of study and discipline are synonyms defined as:

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

field of study (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

field of study (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