Percoidean and Sunfish

Percoidean noun - Any of numerous spiny-finned fishes of the order Perciformes.

Sunfish and percoidean are semantically related. In some cases you can replace term "Sunfish" with "Percoidean", this nouns are similar.

Sunfish noun - Small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies; black bass; bluegills; pumpkinseed.

Percoidean and sunfish are semantically related. Sometimes you can use "Percoidean" instead a noun "Sunfish".