Electric catfish and Silurid fish

Electric catfish noun - Freshwater catfish of the Nile and tropical central Africa having an electric organ.

Silurid fish and electric catfish are semantically related. In some cases you can use "Silurid fish" instead a noun phrase "Electric catfish".

Silurid fish noun - Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin.

Electric catfish and silurid fish are semantically related. Sometimes you can replace phrase "Electric catfish" with "Silurid fish", this phrases are similar.