The term 'crab part' refers to two distinct body parts of a crab. The first is the PINCER, which is a six-letter word. Pincers are the two large, curved appendages located at the front of a crab's body. They are used for defense, capturing prey, and manipulating objects. The second is the CLAW, which is a four-letter word. Claws are the two smaller appendages located on either side of the pincers. They are used for walking, digging, and gathering food.