lockdown vs internment

lockdown and internment both are nouns.

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

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

lockdown: the act of confining prisoners to their cells (usually to regain control during a riot)
internment: the act of confining someone in a prison (or as if in a prison)

Other hypernyms of lockdown include imprisonment.

lockdown (noun)	internment (noun)
the act of confining prisoners to their cells (usually to regain control during a riot)	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