subject area vs bailiwick

subject area and bailiwick both are nouns.

Word	Noun	Adjective	Verb	Adverb
subject area	Yes	No	No	No
bailiwick	Yes	No	No	No

As nouns, subject area and bailiwick are synonyms defined as:

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

subject area (noun)	bailiwick (noun)
a branch of knowledge	a branch of knowledge
	the area over which a bailiff has jurisdiction