Several different words in English identify different types of pigs:

• Boar - An adult male pig

• Sow - An adult female pig
• Piglet/farrow - A juvenile pig
• Shoat - A young pig between 100 to 180 lb (50 to 90 kg)
• Gilt - An immature female pig
• Barrow - A castrated male pig
• Hog - a domestic or wild adult swine, especially one raised for slaughter because they fatten quickly; in its original sense it means a castrated boar.
• Swine - Synonym for "pigs" (plural)