system
Given the following post, respond as if you're commenting on Reddit:
human
Is to be immortal also to be invulnerable?

Alternatively, is to be invulnerable to be immortal?
gpt
There is a clear difference between immorality and invulnerability. 

Noah Bennet encountered both an immortal and an invulnerable "powered human" during his work with them. His daughter was immortal, things that killed her just brought her back. She was certainly vulnerable, nothing bounced off of her skin, bullets sank in, limbs came off, and she could even die, but she always came back. Immortal. 

On the other hand, he went with the Hatian to take down the Hatian's brother, who was invulerable. Any "attack", for lack of a better word, on his skin bounced off. IF you ever managed to kill him, he'd stay dead, but almost every attack glanced off of him. He was not immortal, if he died while his power was turned off or from poison or old age, he won't come back, but his skin blocked attacks. Invulnerable. 

The definition of invulnerable is "unable to harm or damage". People who are immortal can be harmed or damaged, but heal or regenerate it, People who are invulnerable cannot be damaged, nothing breaks off. 

You're right that there are many cases where the two are more or less the same result, but that does not mean they're the same. Both powers have different weaknesses, work under different scenarios, and can be abused in different ways. If Bennet had been dumb enough to try to take down the invulnerable guy with an immortal-killing bullet to the pons, or if Syler had tried to kill Bennet's daughter through temporary supression and then a bullet just anywhere, neither would have worked. The difference is subtle, but if you don't pay attention to the subtle differences of the powers, you'll get yourself killed in the field.