Anthrax and Malignant pustule

Anthrax noun - A highly infectious animal disease (especially cattle and sheep); it can be transmitted to people.

Malignant pustule and anthrax are semantically related. In some cases you can replace phrase "Malignant pustule" with "Anthrax", this terms are similar.

Malignant pustule noun - A form of anthrax infection that begins as papule that becomes a vesicle and breaks with a discharge of toxins; symptoms of septicemia are severe with vomiting and high fever and profuse sweating; the infection is often fatal.

Anthrax and malignant pustule are semantically related. You can use "Anthrax" instead a noun phrase "Malignant pustule".