domain vs barony

domain and barony both are nouns.

Word	Noun	Adjective	Verb	Adverb
domain	Yes	No	No	No
barony	Yes	No	No	No

As nouns, barony is a hyponym of domain; that is, barony is a word with a more specific, narrower meaning than domain:

domain (noun)	barony (noun)
the content of a particular field of knowledge	the domain of a baron
people in general; especially a distinctive group of people with some shared interest	the estate of a baron
(mathematics) the set of values of the independent variable for which a function is defined	the rank or dignity or position of a baronet or baroness
territory over which rule or control is exercised
a particular environment or walk of life