bailiwick vs knowledge domain

bailiwick and knowledge domain both are nouns.

Word	Noun	Adjective	Verb	Adverb
bailiwick	Yes	No	No	No
knowledge domain	Yes	No	No	No

As nouns, knowledge domain is a hypernym of bailiwick; that is, knowledge domain is a word with a broader meaning than bailiwick:

Other hypernyms of bailiwick include domain, knowledge base.

bailiwick (noun)	knowledge domain (noun)
a branch of knowledge	the content of a particular field of knowledge
the area over which a bailiff has jurisdiction