Dear Milton

Pasul refers to a sacrifice being invalid. This means that its blood cannot be sprinkled, its meat cannot eaten, and normally it cannot be placed on the alter's fire.

Pigul is a particular type of Pasul of the sacrifice. This is when a Cohen, while doing one of the four actions of offering a sacrifice, intends to a do part of the offering (eating or placing on fire) at the wrong time. The four actions where this wrong intention can apply are slaughtering, receiving the blood, moving the blood to the alter or sprinkling the blood.

Besides it being invalid, anyone later eating from such a sacrifice receives Koreis. (See Zevachim chapter 2,3 for more details).

All the best

Reuven Weiner