trust territory vs trusteeship

trust territory and trusteeship both are nouns.

Word	Noun	Adjective	Verb	Adverb
trust territory	Yes	No	No	No
trusteeship	Yes	No	No	No

As nouns, trust territory and trusteeship are synonyms defined as:

trust territory and trusteeship: a dependent country; administered by another country under the supervision of the United Nations

trust territory (noun)	trusteeship (noun)
a dependent country; administered by another country under the supervision of the United Nations	the position of trustee
	a dependent country; administered by another country under the supervision of the United Nations