Goby and Percoid

Goby noun - Small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker.

Percoid and goby are semantically related. In some cases you can use "Percoid" instead a noun "Goby".

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

Goby and percoid are semantically related. Sometimes you can replace term "Goby" with "Percoid", this nouns are similar.