Concentration vs extermination camps

A concentration camp is basically a place where the segregated groups were sent during World War II (Germany and United States). They were confined in large areas,and were put in the worst conditions. There are several types of concentration camps which include work camps, prisoner camps, holding camps. Concentration camps are not exclusive of Germany and Mr. Funny Moustache, but also Unites States, the extinct Sovietic Union (USSR)and even Japan. These countries built concentration camps to hold war prisoners. Mistreat is a common feature in these sites regarldess the origin of the camp.
Extermination camps in contrast are exclusivley meant for the disappearance and destruction of a targeted groups of people. I have thought of many synomyms for this horrid places... Camp Death, Agonic camp, Nightmare camp, Breathless camp and others which I prefer not mentioning.
Mr. Crow: The Angel of Death as Elie Wiesel says lives in these camps. There is; however, a light relation between concentration and extermination. Concentration camps often lead into an extermination camp. The mediums of death are quite diverse, a piece of psychological terror is present in the heart of those who were/ are doomed to die.