science vs bailiwick

science and bailiwick both are nouns.

Word	Noun	Adjective	Verb	Adverb
science	Yes	No	No	No
bailiwick	Yes	No	No	No

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

Other hypernyms of science include discipline, field, field of study, study, subject, subject area, subject field.

science (noun)	bailiwick (noun)
a particular branch of scientific knowledge	a branch of knowledge
ability to produce solutions in some problem domain	the area over which a bailiff has jurisdiction