Oh yes! I had totally forgotten his ability to learn languages! I have a head canon that Namor is not just good with languages but is a Hyperployglot (One who masters or becomes fluent in many different languages). Oh I also didn't include fireproof in that too, thanks!
I read a comic from his time in the x-men where Namor states he can smell water, so yes he totally dos have that ability to know when water is near by. Thank you so much for this list! I wasn't sure about his empathetic/telepathic powers but that is so cool.