Catfish and Cat fish

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

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

Catfish and cat fish are semantically related. You can use "Catfish" instead a noun phrase "Cat fish".