impoundment vs internment

impoundment and internment both are nouns.

Word	Noun	Adjective	Verb	Adverb
impoundment	Yes	No	No	No
internment	Yes	No	No	No

As nouns, impoundment and internment are synonyms defined as:

impoundment and internment: placing private property in the custody of an officer of the law

Other synonyms of impoundment include impounding, poundage.

impoundment (noun)	internment (noun)
placing private property in the custody of an officer of the law	the act of confining someone in a prison (or as if in a prison)
	placing private property in the custody of an officer of the law
	confinement during wartime