Blennioid fish and Prickleback

Blennioid fish noun - Elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins.

Prickleback and blennioid fish are semantically related. In some cases you can replace term "Prickleback" with "Blennioid fish", this terms are similar.

Prickleback noun - Small elongate fishes of shallow northern seas; a long dorsal fin consists entirely of spines.

Blennioid fish and prickleback are semantically related. You can use "Blennioid fish" instead a noun "Prickleback".