Catfish and Silurid fish

Catfish noun - Any of numerous mostly freshwater bottom-living fishes of Eurasia and North America with barbels like whiskers around the mouth.

Silurid fish and catfish are semantically related. In some cases you can replace phrase "Silurid fish" with "Catfish", this terms are similar.

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

Catfish and silurid fish are semantically related. You can use "Catfish" instead a noun phrase "Silurid fish".