Nosing

To move cautiously by advancing its front end.

"The ship nosed through the minefield."

To snoop.

"She was nosing around other people’s business."

To detect by smell or as if by smell.

To push with one's nose; to nuzzle.

An animal's pushing or exploration with the nose.

That part of the treadboard of a stair that projects over the riser.

Any similar projection, such as the projecting edge of a moulding.