a predatory person : LEECH

Pronunciation:
HAR-pee

In a sentence:
When Jacob’s friends called him a harpy, they did so because he never bought his own cigarettes. When they called him an idiot, they did so because he insisted on smoking, despite being aware of all the known risks.

In a different sentence:
Although it was clear to all her friends that Gina was a harpy and a money hoarder, they still loved her for her sense of humor and her willingness to share any prescription medication she might have available.