Knag :: Knag (n.) A knot in wood; a protuberance.
Knag :: Knag (n.) A wooden peg for hanging things on.
Knag :: Knag (n.) The prong of an antler.
Knag :: Knag (n.) The rugged top of a hill.
Knaggy :: Knaggy (a.) Knotty; rough; figuratively, rough in temper..