Cobra and Naja nigricollis

Cobra noun - Venomous Asiatic and African elapid snakes that can expand the skin of the neck into a hood.

Naja nigricollis and cobra are semantically related. In some cases you can replace phrase "Naja nigricollis" with "Cobra", this terms are similar.

Naja nigricollis noun - Aggressive cobra widely distributed in Africa; rarely bites but spits venom that may cause blindness.

Cobra and Naja nigricollis are semantically related. You can use "Cobra" instead a noun phrase "Naja nigricollis".