Black-necked cobra and Cobra

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

Cobra and black-necked cobra are semantically related. In some cases you can use "Cobra" instead a noun phrase "Black-necked cobra".

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

Black-necked cobra and cobra are semantically related. Sometimes you can replace phrase "Black-necked cobra" with "Cobra", this terms are similar.