Nosing vs Rosing - What's the difference?

As verbs the difference between nosing and rosing

is that nosing is while rosing is .

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

(head)

(en noun)

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

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

* *

(head)