knag vs treenail

knag

• A peg or hook for hanging something on 

• A pointed rock or crag 

• A small cask or barrel; a keg or noggin 

• A knot in a piece of wood or the base of a branch 

• A short spur or stiff projection from the trunk or branch of a tree, such as the stunted dead branch of a fir 

• To hang something on a peg 

treenail

• A wooden peg or pin used as a fastener.