trusteeship vs dominion

trusteeship and dominion both are nouns.

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

As nouns, dominion is a hypernym of trusteeship; that is, dominion is a word with a broader meaning than trusteeship:

trusteeship: a dependent country; administered by another country under the supervision of the United Nations
dominion: a region marked off for administrative or other purposes

Other hypernyms of trusteeship include district, territorial dominion, territory.

trusteeship (noun)	dominion (noun)
the position of trustee	a region marked off for administrative or other purposes
a dependent country; administered by another country under the supervision of the United Nations	dominance or power through legal authority