territory vs dominion

territory and dominion both are nouns.

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

As nouns, territory and dominion are synonyms defined as:

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

Other synonyms of territory include district, territorial dominion.

territory (noun)	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	dominance or power through legal authority
the geographical area under the jurisdiction of a sovereign state