What is a nose tackle?

The positions are functionally interchangable in that both positions line up "nose-to-nose" with the middle offensive lineman, the Center; the difference comes in why and how the player finds himself...

6'4 301 lbs

Your nose runs on you, you know, nose gunk. And if you ran on your nose then you wouldn't be able to breath through it!

because they nose how to smell

If the piercing is recent, very carefully, once it is healed, you can clean it as usual.