Catfish and Trout

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

Trout and catfish are semantically related in fish topic. In some cases you can use "Trout" instead a noun "Catfish".

Trout noun - Any of various game and food fishes of cool fresh waters mostly smaller than typical salmons.

Catfish and trout are semantically related in fish topic. You can use "Catfish" instead a noun "Trout".