Knicker :: Knicker (n.) A small ball of clay, baked hard and oiled, used as a marble by boys in playing..
Knickerbockers :: Knickerbockers (n. pl.) The name for a style of short breeches; smallclothes.
Knickknack :: Knickknack (n.) A trifle or toy; a bawble; a gewgaw.