knag

noun

1.
a hard cross-grained round piece of wood in a board where a branch emerged
knot
2.
anything from which something can be hung
hanger
3.
a steep rugged rock or cliff
heugh crag
4.
a short piece remaining on a trunk or stem where a branch is lost
cag kerf stub
5.
small cask or barrel
cag keg
6.
one of the bony outgrowths on the heads of certain ungulates
blowhorn horn