GIN - A colourless non-aged alcoholic liquor made by distilling fermented grains such as barley, corn, oats or rye with juniper berries; the base for many cocktails.
GUN - A very portable, short firearm, for hand use, which fires bullets or projectiles, such as a handgun, revolver, pistol, or Derringer.
PIG - Any of several mammals of the genus Sus, having cloven hooves, bristles and a nose adapted for digging; especially the domesticated farm animal Sus scrofa.
PIN - A small device, made (usually) of drawn-out steel wire with one end sharpened and the other flattened or rounded into a head, used for fastening.
PUG - The footprint of an animal. (Also pugmark) (From the Hindi for 'foot', related to Sanskrit 'padh' and Greek 'ped').
PUP - A young dog, wolf, fox, seal, shark and some other animals.
NIP - A small quantity of something edible or a potable liquor.
PUN - To beat; strike with force; ram; pound, as in a mortar; reduce to powder.
GNU - A large antelope native to Africa having curved horns.
PING - A high-pitched, short and somewhat sharp sound.
UPPING - Present participle of up.