EGO - The self, especially with a sense of self-importance.
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.
ION - An atom or group of atoms bearing an electrical charge such as the sodium and chlorine atoms in a salt solution.
ONE - A numerical value equal to 1; the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set. Ordinal: first.
PEN - An enclosed area used to contain domesticated animals, especially sheep or cattle.
PIE - A type of pastry that consists of an outer crust and a filling.
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.
NIP - A small quantity of something edible or a potable liquor.
PEG - A cylindrical wooden, metal etc. object used to fasten or as a bearing between objects.
GONE - Past participle of go.
NOPE - To hit someone on the head.
OPEN - Which is not closed; accessible; unimpeded; as, an open gate.
PINE - Any coniferous tree of the genus Pinus.
PING - A high-pitched, short and somewhat sharp sound.
PEON - A lowly person, a peasant or serf, a labourer who is obliged to do menial work.
PONG - A packet that is replying to a ping, and thereby indicating the presence of a host.
PIGEON - One of several birds of the family Columbidae, which consists of more than 300 species.