EGG - An approximately spherical or ellipsoidal body produced by birds, snakes, insects and other animals housing the embryo during its development.
GUN - A very portable, short firearm, for hand use, which fires bullets or projectiles, such as a handgun, revolver, pistol, or Derringer.
RUG - A partial covering for a floor.
RUN - Act or instance of running, of moving rapidly using the feet.
URN - A vase with a footed base.
RUE - Repentance, regret.
GNU - A large antelope native to Africa having curved horns.
RUNG - A crosspiece forming a step of a ladder; a round.
URGE - A strong desire; an itch to do something.
RUNE - A letter, or character, belonging to the written language of various ancient Germanic peoples, especially the Scandinavians and the Anglo-Saxons.
GRUNGE - Dirt or filth, especially when difficult to clean.