internment vs captivity

internment and captivity both are nouns.

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

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

Other hypernyms of internment include immurement, imprisonment, incarceration.

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