Gull (noun)

1. A seabird with long wings, a white body and gray or black back and wings.
2. A person who is easily deceived or cheated.

Origin:

From old norse "gyllir".

Examples:

1. The shore was lined with gulls, their cries filling the air.
2. The gulls were diving into the water to catch fish.
3. He was able to take advantage of the gullible tourists and sell them fake handbags.
4. The businessman was arrested for scamming gullible investors out of their money.
5. The company's reputation was tarnished after it was discovered they had been taking advantage of gullible customers.