Prickleback and Spiny-finned fish

Prickleback noun - Small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research.

Spiny-finned fish and prickleback are semantically related. In some cases you can use "Spiny-finned fish" instead a noun "Prickleback".

Spiny-finned fish noun - A teleost fish with fins that are supported by sharp inflexible rays.

Prickleback and spiny-finned fish are semantically related. Sometimes you can replace term "Prickleback" with "Spiny-finned fish", this terms are similar.