Again, probably, already has been asked before. "Invulnerability" has a very literal meaning. They are IMPOSSIBLE to truly harm or kill. It has a sort of arcane connotation to it. There's a big difference between a guy who can take a lot of hits (like Colossus) and a guy who the universe literally refuses to let die (like Wolverine. Har har.) Joke example, aside, I think it's useful to distinguish because seeing The Thing with "invulnerability" (and intelligence...) is kind of weird.
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