In House M.D., what nickname does Amber Volakis receive during the fellowship competition?

Amber Volakis is nicknamed “Cutthroat Bitch” during the House M.D. fellowship competition.

Amber, played by Anne Dudek, is one of the doctors competing for positions on House's new diagnostic team in the fourth season. Her aggressive tactics, ambition, and willingness to compete intensely lead House and the other applicants to use the nickname.

The competition begins after House is required to rebuild his team. Instead of selecting a small group through a conventional hiring process, he brings a large group of applicants into a demanding series of tests and medical cases. Amber stands out because she is strategically ruthless and highly competitive.

The nickname is a character label within the series, not Amber's formal name or medical title. She is also known as “the bitch” in some dialogue, but “Cutthroat Bitch” is the established full nickname associated with her. Amber's storyline later becomes closely connected to Wilson and to major events at the end of season four.