territory vs territorial dominion

territory and territorial dominion both are nouns.

Word	Noun	Adjective	Verb	Adverb
territory	Yes	No	No	No
territorial dominion	Yes	No	No	No

As nouns, territory and territorial dominion are synonyms defined as:

territory and territorial dominion: a region marked off for administrative or other purposes

Other synonyms of territory include district, dominion.

territory (noun)	territorial dominion (noun)
an area of knowledge or interest	a region marked off for administrative or other purposes
a region marked off for administrative or other purposes
the geographical area under the jurisdiction of a sovereign state