communications vs bailiwick

communications and bailiwick both are nouns.

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

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

communications: the discipline that studies the principles of transmitting information and the methods by which it is delivered (as print or radio or television etc.)
bailiwick: a branch of knowledge

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

communications (noun)	bailiwick (noun)
the discipline that studies the principles of transmitting information and the methods by which it is delivered (as print or radio or television etc.)	a branch of knowledge
	the area over which a bailiff has jurisdiction