Agkistrodon piscivorus and Pit viper

Agkistrodon piscivorus noun - Venomous semiaquatic snake of swamps in southern United States.

Pit viper and Agkistrodon piscivorus are semantically related. In some cases you can use "Pit viper" instead a noun phrase "Agkistrodon piscivorus".

Pit viper noun - New World vipers with hollow fangs and a heat-sensitive pit on each side of the head.

Agkistrodon piscivorus and pit viper are semantically related. Sometimes you can replace phrase "Agkistrodon piscivorus" with "Pit viper", this phrases are similar.