Catfish and Silurid

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

Silurid and catfish are semantically related. In some cases you can replace term "Silurid" with "Catfish", this nouns are similar.

Silurid 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 are semantically related. You can use "Catfish" instead a noun "Silurid".