Actually that's not necessarily true, even though it's obsolete it ["corpse"] can refer to a living body.
corpse - noun
1. a dead body, usually of a human being.
2. something no longer useful or viable: rusting corpses of old cars.
3. Obsolete. a human or animal body, whether alive or dead.
If you've done any research into Christian Theology you would be familiar with this, as "the Corpse of Christ"* is not unheard of; indeed it is prominant in the name of a Texas town: Corpus Christi.
* Jesus is not dead, though He died He lives forevermore.
Let me know next time you see a corpse walking around.
Corpus is Latin for body but that is different than corpse.
You passed the IQ test. Literally one in thousands gets that.