internment vs immurement

internment and immurement both are nouns.

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

As nouns, immurement is a hypernym of internment; that is, immurement is a word with a broader meaning than internment:

Other hypernyms of internment include captivity, imprisonment, incarceration.

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