Nuances

internment - noun. 1) the state of being interned; confinement. 2) the act of interning or state of being interned, esp of enemy citizens in wartime or of terrorism suspects. 3) as modifier - an internment camp

interment - noun. 1) the act or ceremony of interring; burial.

Very close, and often confused. I myself had to look them both up, after seeing "interment" all over at the funeral home and figuring they of all people wouldn't spell that word wrong.

I'm not convinced the difference really matters anyway. They both seem like torture to me.